Theorem cos02pilt1 15842

Description: Cosine is less than one between zero and 2 x. pi. (Contributed by Jim Kingdon, 19-Mar-2024.)

Assertion

Ref	Expression
cos02pilt1	|- ( A e. ( 0 (,) ( 2 x. pi ) ) -> ( cos ` A ) < 1 )

Proof of Theorem cos02pilt1

Step	Hyp	Ref	Expression
1		elioore 10264	. . . . . . 7 |- ( A e. ( 0 (,) ( 2 x. pi ) ) -> A e. RR )
2	1	adantr 276	. . . . . 6 |- ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ ( pi / 2 ) < A ) -> A e. RR )
3	2	adantr 276	. . . . 5 |- ( ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ ( pi / 2 ) < A ) /\ pi < A ) -> A e. RR )
4		pire 15777	. . . . . . 7 |- pi e. RR
5	4	a1i 9	. . . . . 6 |- ( ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ ( pi / 2 ) < A ) /\ pi < A ) -> pi e. RR )
6		simpr 110	. . . . . 6 |- ( ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ ( pi / 2 ) < A ) /\ pi < A ) -> pi < A )
7	5, 3, 6	ltled 8408	. . . . 5 |- ( ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ ( pi / 2 ) < A ) /\ pi < A ) -> pi <_ A )
8		0xr 8336	. . . . . . . 8 |- 0 e. RR*
9		2re 9324	. . . . . . . . . 10 |- 2 e. RR
10	9, 4	remulcli 8304	. . . . . . . . 9 |- ( 2 x. pi ) e. RR
11	10	rexri 8347	. . . . . . . 8 |- ( 2 x. pi ) e. RR*
12		elioo2 10273	. . . . . . . 8 |- ( ( 0 e. RR* /\ ( 2 x. pi ) e. RR* ) -> ( A e. ( 0 (,) ( 2 x. pi ) ) <-> ( A e. RR /\ 0 < A /\ A < ( 2 x. pi ) ) ) )
13	8, 11, 12	mp2an 426	. . . . . . 7 |- ( A e. ( 0 (,) ( 2 x. pi ) ) <-> ( A e. RR /\ 0 < A /\ A < ( 2 x. pi ) ) )
14	13	simp3bi 1041	. . . . . 6 |- ( A e. ( 0 (,) ( 2 x. pi ) ) -> A < ( 2 x. pi ) )
15	14	ad2antrr 488	. . . . 5 |- ( ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ ( pi / 2 ) < A ) /\ pi < A ) -> A < ( 2 x. pi ) )
16		elico2 10289	. . . . . 6 |- ( ( pi e. RR /\ ( 2 x. pi ) e. RR* ) -> ( A e. ( pi [,) ( 2 x. pi ) ) <-> ( A e. RR /\ pi <_ A /\ A < ( 2 x. pi ) ) ) )
17	4, 11, 16	mp2an 426	. . . . 5 |- ( A e. ( pi [,) ( 2 x. pi ) ) <-> ( A e. RR /\ pi <_ A /\ A < ( 2 x. pi ) ) )
18	3, 7, 15, 17	syl3anbrc 1208	. . . 4 |- ( ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ ( pi / 2 ) < A ) /\ pi < A ) -> A e. ( pi [,) ( 2 x. pi ) ) )
19		cosq34lt1 15841	. . . 4 |- ( A e. ( pi [,) ( 2 x. pi ) ) -> ( cos ` A ) < 1 )
20	18, 19	syl 14	. . 3 |- ( ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ ( pi / 2 ) < A ) /\ pi < A ) -> ( cos ` A ) < 1 )
21	2	adantr 276	. . . . 5 |- ( ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ ( pi / 2 ) < A ) /\ A < ( 3 x. ( pi / 2 ) ) ) -> A e. RR )
22		simplr 529	. . . . 5 |- ( ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ ( pi / 2 ) < A ) /\ A < ( 3 x. ( pi / 2 ) ) ) -> ( pi / 2 ) < A )
23		simpr 110	. . . . 5 |- ( ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ ( pi / 2 ) < A ) /\ A < ( 3 x. ( pi / 2 ) ) ) -> A < ( 3 x. ( pi / 2 ) ) )
24		halfpire 15783	. . . . . . 7 |- ( pi / 2 ) e. RR
25	24	rexri 8347	. . . . . 6 |- ( pi / 2 ) e. RR*
26		3re 9328	. . . . . . . 8 |- 3 e. RR
27	26, 24	remulcli 8304	. . . . . . 7 |- ( 3 x. ( pi / 2 ) ) e. RR
28	27	rexri 8347	. . . . . 6 |- ( 3 x. ( pi / 2 ) ) e. RR*
29		elioo2 10273	. . . . . 6 |- ( ( ( pi / 2 ) e. RR* /\ ( 3 x. ( pi / 2 ) ) e. RR* ) -> ( A e. ( ( pi / 2 ) (,) ( 3 x. ( pi / 2 ) ) ) <-> ( A e. RR /\ ( pi / 2 ) < A /\ A < ( 3 x. ( pi / 2 ) ) ) ) )
30	25, 28, 29	mp2an 426	. . . . 5 |- ( A e. ( ( pi / 2 ) (,) ( 3 x. ( pi / 2 ) ) ) <-> ( A e. RR /\ ( pi / 2 ) < A /\ A < ( 3 x. ( pi / 2 ) ) ) )
31	21, 22, 23, 30	syl3anbrc 1208	. . . 4 |- ( ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ ( pi / 2 ) < A ) /\ A < ( 3 x. ( pi / 2 ) ) ) -> A e. ( ( pi / 2 ) (,) ( 3 x. ( pi / 2 ) ) ) )
32		elioore 10264	. . . . . 6 |- ( A e. ( ( pi / 2 ) (,) ( 3 x. ( pi / 2 ) ) ) -> A e. RR )
33	32	recoscld 12435	. . . . 5 |- ( A e. ( ( pi / 2 ) (,) ( 3 x. ( pi / 2 ) ) ) -> ( cos ` A ) e. RR )
34		0red 8291	. . . . 5 |- ( A e. ( ( pi / 2 ) (,) ( 3 x. ( pi / 2 ) ) ) -> 0 e. RR )
35		1red 8305	. . . . 5 |- ( A e. ( ( pi / 2 ) (,) ( 3 x. ( pi / 2 ) ) ) -> 1 e. RR )
36		cosq23lt0 15824	. . . . 5 |- ( A e. ( ( pi / 2 ) (,) ( 3 x. ( pi / 2 ) ) ) -> ( cos ` A ) < 0 )
37		0lt1 8416	. . . . . 6 |- 0 < 1
38	37	a1i 9	. . . . 5 |- ( A e. ( ( pi / 2 ) (,) ( 3 x. ( pi / 2 ) ) ) -> 0 < 1 )
39	33, 34, 35, 36, 38	lttrd 8415	. . . 4 |- ( A e. ( ( pi / 2 ) (,) ( 3 x. ( pi / 2 ) ) ) -> ( cos ` A ) < 1 )
40	31, 39	syl 14	. . 3 |- ( ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ ( pi / 2 ) < A ) /\ A < ( 3 x. ( pi / 2 ) ) ) -> ( cos ` A ) < 1 )
41		2lt3 9425	. . . . . 6 |- 2 < 3
42		2pos 9345	. . . . . . . 8 |- 0 < 2
43	9, 42	pm3.2i 272	. . . . . . 7 |- ( 2 e. RR /\ 0 < 2 )
44		3pos 9348	. . . . . . . 8 |- 0 < 3
45	26, 44	pm3.2i 272	. . . . . . 7 |- ( 3 e. RR /\ 0 < 3 )
46		pipos 15779	. . . . . . . 8 |- 0 < pi
47	4, 46	pm3.2i 272	. . . . . . 7 |- ( pi e. RR /\ 0 < pi )
48		ltdiv2 9178	. . . . . . 7 |- ( ( ( 2 e. RR /\ 0 < 2 ) /\ ( 3 e. RR /\ 0 < 3 ) /\ ( pi e. RR /\ 0 < pi ) ) -> ( 2 < 3 <-> ( pi / 3 ) < ( pi / 2 ) ) )
49	43, 45, 47, 48	mp3an 1374	. . . . . 6 |- ( 2 < 3 <-> ( pi / 3 ) < ( pi / 2 ) )
50	41, 49	mpbi 145	. . . . 5 |- ( pi / 3 ) < ( pi / 2 )
51		ltdivmul 9167	. . . . . 6 |- ( ( pi e. RR /\ ( pi / 2 ) e. RR /\ ( 3 e. RR /\ 0 < 3 ) ) -> ( ( pi / 3 ) < ( pi / 2 ) <-> pi < ( 3 x. ( pi / 2 ) ) ) )
52	4, 24, 45, 51	mp3an 1374	. . . . 5 |- ( ( pi / 3 ) < ( pi / 2 ) <-> pi < ( 3 x. ( pi / 2 ) ) )
53	50, 52	mpbi 145	. . . 4 |- pi < ( 3 x. ( pi / 2 ) )
54		axltwlin 8357	. . . . 5 |- ( ( pi e. RR /\ ( 3 x. ( pi / 2 ) ) e. RR /\ A e. RR ) -> ( pi < ( 3 x. ( pi / 2 ) ) -> ( pi < A \/ A < ( 3 x. ( pi / 2 ) ) ) ) )
55	4, 27, 2, 54	mp3an12i 1378	. . . 4 |- ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ ( pi / 2 ) < A ) -> ( pi < ( 3 x. ( pi / 2 ) ) -> ( pi < A \/ A < ( 3 x. ( pi / 2 ) ) ) ) )
56	53, 55	mpi 15	. . 3 |- ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ ( pi / 2 ) < A ) -> ( pi < A \/ A < ( 3 x. ( pi / 2 ) ) ) )
57	20, 40, 56	mpjaodan 806	. 2 |- ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ ( pi / 2 ) < A ) -> ( cos ` A ) < 1 )
58	4	rexri 8347	. . . . . 6 |- pi e. RR*
59		0re 8290	. . . . . . 7 |- 0 e. RR
60	59, 4, 46	ltleii 8392	. . . . . 6 |- 0 <_ pi
61		lbicc2 10336	. . . . . 6 |- ( ( 0 e. RR* /\ pi e. RR* /\ 0 <_ pi ) -> 0 e. ( 0 [,] pi ) )
62	8, 58, 60, 61	mp3an 1374	. . . . 5 |- 0 e. ( 0 [,] pi )
63	62	a1i 9	. . . 4 |- ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ A < pi ) -> 0 e. ( 0 [,] pi ) )
64	1	adantr 276	. . . . 5 |- ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ A < pi ) -> A e. RR )
65		0red 8291	. . . . . 6 |- ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ A < pi ) -> 0 e. RR )
66	13	simp2bi 1040	. . . . . . 7 |- ( A e. ( 0 (,) ( 2 x. pi ) ) -> 0 < A )
67	66	adantr 276	. . . . . 6 |- ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ A < pi ) -> 0 < A )
68	65, 64, 67	ltled 8408	. . . . 5 |- ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ A < pi ) -> 0 <_ A )
69	4	a1i 9	. . . . . 6 |- ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ A < pi ) -> pi e. RR )
70		simpr 110	. . . . . 6 |- ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ A < pi ) -> A < pi )
71	64, 69, 70	ltled 8408	. . . . 5 |- ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ A < pi ) -> A <_ pi )
72	59, 4	elicc2i 10291	. . . . 5 |- ( A e. ( 0 [,] pi ) <-> ( A e. RR /\ 0 <_ A /\ A <_ pi ) )
73	64, 68, 71, 72	syl3anbrc 1208	. . . 4 |- ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ A < pi ) -> A e. ( 0 [,] pi ) )
74	63, 73, 67	cosordlem 15840	. . 3 |- ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ A < pi ) -> ( cos ` A ) < ( cos ` 0 ) )
75		cos0 12441	. . 3 |- ( cos ` 0 ) = 1
76	74, 75	breqtrdi 4155	. 2 |- ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ A < pi ) -> ( cos ` A ) < 1 )
77		pirp 15780	. . . 4 |- pi e. RR+
78		rphalflt 10034	. . . 4 |- ( pi e. RR+ -> ( pi / 2 ) < pi )
79	77, 78	ax-mp 5	. . 3 |- ( pi / 2 ) < pi
80		axltwlin 8357	. . . 4 |- ( ( ( pi / 2 ) e. RR /\ pi e. RR /\ A e. RR ) -> ( ( pi / 2 ) < pi -> ( ( pi / 2 ) < A \/ A < pi ) ) )
81	24, 4, 1, 80	mp3an12i 1378	. . 3 |- ( A e. ( 0 (,) ( 2 x. pi ) ) -> ( ( pi / 2 ) < pi -> ( ( pi / 2 ) < A \/ A < pi ) ) )
82	79, 81	mpi 15	. 2 |- ( A e. ( 0 (,) ( 2 x. pi ) ) -> ( ( pi / 2 ) < A \/ A < pi ) )
83	57, 76, 82	mpjaodan 806	1 |- ( A e. ( 0 (,) ( 2 x. pi ) ) -> ( cos ` A ) < 1 )

Syntax hints:   -> wi 4   /\ wa 104   <-> wb 105   \/ wo 716   /\ w3a 1005   e. wcel 2205   class class class wbr 4114   ` cfv 5357  (class class class)co 6058   RRcr 8142   0cc0 8143   1c1 8144   x. cmul 8148   RR*cxr 8323   < clt 8324   <_ cle 8325   / cdiv 8963   2c2 9305   3c3 9306   RR+crp 10004   (,)cioo 10240   [,)cico 10242   [,]cicc 10243   cosccos 12356   picpi 12358

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2207  ax-14 2208  ax-ext 2216  ax-coll 4230  ax-sep 4233  ax-nul 4241  ax-pow 4292  ax-pr 4327  ax-un 4559  ax-setind 4664  ax-iinf 4715  ax-cnex 8234  ax-resscn 8235  ax-1cn 8236  ax-1re 8237  ax-icn 8238  ax-addcl 8239  ax-addrcl 8240  ax-mulcl 8241  ax-mulrcl 8242  ax-addcom 8243  ax-mulcom 8244  ax-addass 8245  ax-mulass 8246  ax-distr 8247  ax-i2m1 8248  ax-0lt1 8249  ax-1rid 8250  ax-0id 8251  ax-rnegex 8252  ax-precex 8253  ax-cnre 8254  ax-pre-ltirr 8255  ax-pre-ltwlin 8256  ax-pre-lttrn 8257  ax-pre-apti 8258  ax-pre-ltadd 8259  ax-pre-mulgt0 8260  ax-pre-mulext 8261  ax-arch 8262  ax-caucvg 8263  ax-pre-suploc 8264  ax-addf 8265  ax-mulf 8266

This theorem depends on definitions:  df-bi 117  df-stab 839  df-dc 843  df-3or 1006  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ne 2415  df-nel 2510  df-ral 2527  df-rex 2528  df-reu 2529  df-rmo 2530  df-rab 2531  df-v 2817  df-sbc 3046  df-csb 3142  df-dif 3216  df-un 3218  df-in 3220  df-ss 3227  df-nul 3513  df-if 3625  df-pw 3676  df-sn 3700  df-pr 3701  df-op 3703  df-uni 3920  df-int 3955  df-iun 3998  df-disj 4091  df-br 4115  df-opab 4177  df-mpt 4178  df-tr 4214  df-id 4419  df-po 4422  df-iso 4423  df-iord 4492  df-on 4494  df-ilim 4495  df-suc 4497  df-iom 4718  df-xp 4760  df-rel 4761  df-cnv 4762  df-co 4763  df-dm 4764  df-rn 4765  df-res 4766  df-ima 4767  df-iota 5317  df-fun 5359  df-fn 5360  df-f 5361  df-f1 5362  df-fo 5363  df-f1o 5364  df-fv 5365  df-isom 5366  df-riota 6011  df-ov 6061  df-oprab 6062  df-mpo 6063  df-of 6275  df-1st 6347  df-2nd 6348  df-recs 6549  df-irdg 6614  df-frec 6635  df-1o 6660  df-oadd 6664  df-er 6780  df-map 6897  df-pm 6898  df-en 6989  df-dom 6990  df-fin 6991  df-sup 7288  df-inf 7289  df-pnf 8326  df-mnf 8327  df-xr 8328  df-ltxr 8329  df-le 8330  df-sub 8462  df-neg 8463  df-reap 8866  df-ap 8873  df-div 8964  df-inn 9255  df-2 9313  df-3 9314  df-4 9315  df-5 9316  df-6 9317  df-7 9318  df-8 9319  df-9 9320  df-n0 9514  df-z 9595  df-uz 9872  df-q 9970  df-rp 10005  df-xneg 10124  df-xadd 10125  df-ioo 10244  df-ioc 10245  df-ico 10246  df-icc 10247  df-fz 10362  df-fzo 10499  df-seqfrec 10834  df-exp 10925  df-fac 11113  df-bc 11135  df-ihash 11164  df-shft 11525  df-cj 11552  df-re 11553  df-im 11554  df-rsqrt 11708  df-abs 11709  df-clim 11989  df-sumdc 12064  df-ef 12359  df-sin 12361  df-cos 12362  df-pi 12364  df-rest 13538  df-topgen 13557  df-psmet 14817  df-xmet 14818  df-met 14819  df-bl 14820  df-mopn 14821  df-top 14989  df-topon 15002  df-bases 15034  df-ntr 15087  df-cn 15179  df-cnp 15180  df-tx 15244  df-cncf 15562  df-limced 15647  df-dvap 15648

This theorem is referenced by:  cos0pilt1  15843  taupi  16985