Theorem cos02pilt1 15716

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 10245	. . . . . . 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 15651	. . . . . . 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 8392	. . . . 5 |- ( ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ ( pi / 2 ) < A ) /\ pi < A ) -> pi <_ A )
8		0xr 8320	. . . . . . . 8 |- 0 e. RR*
9		2re 9307	. . . . . . . . . 10 |- 2 e. RR
10	9, 4	remulcli 8288	. . . . . . . . 9 |- ( 2 x. pi ) e. RR
11	10	rexri 8331	. . . . . . . 8 |- ( 2 x. pi ) e. RR*
12		elioo2 10254	. . . . . . . 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 10270	. . . . . 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 15715	. . . 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 15657	. . . . . . 7 |- ( pi / 2 ) e. RR
25	24	rexri 8331	. . . . . 6 |- ( pi / 2 ) e. RR*
26		3re 9311	. . . . . . . 8 |- 3 e. RR
27	26, 24	remulcli 8288	. . . . . . 7 |- ( 3 x. ( pi / 2 ) ) e. RR
28	27	rexri 8331	. . . . . 6 |- ( 3 x. ( pi / 2 ) ) e. RR*
29		elioo2 10254	. . . . . 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 10245	. . . . . 6 |- ( A e. ( ( pi / 2 ) (,) ( 3 x. ( pi / 2 ) ) ) -> A e. RR )
33	32	recoscld 12410	. . . . 5 |- ( A e. ( ( pi / 2 ) (,) ( 3 x. ( pi / 2 ) ) ) -> ( cos ` A ) e. RR )
34		0red 8275	. . . . 5 |- ( A e. ( ( pi / 2 ) (,) ( 3 x. ( pi / 2 ) ) ) -> 0 e. RR )
35		1red 8289	. . . . 5 |- ( A e. ( ( pi / 2 ) (,) ( 3 x. ( pi / 2 ) ) ) -> 1 e. RR )
36		cosq23lt0 15698	. . . . 5 |- ( A e. ( ( pi / 2 ) (,) ( 3 x. ( pi / 2 ) ) ) -> ( cos ` A ) < 0 )
37		0lt1 8400	. . . . . 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 8399	. . . 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 9408	. . . . . 6 |- 2 < 3
42		2pos 9328	. . . . . . . 8 |- 0 < 2
43	9, 42	pm3.2i 272	. . . . . . 7 |- ( 2 e. RR /\ 0 < 2 )
44		3pos 9331	. . . . . . . 8 |- 0 < 3
45	26, 44	pm3.2i 272	. . . . . . 7 |- ( 3 e. RR /\ 0 < 3 )
46		pipos 15653	. . . . . . . 8 |- 0 < pi
47	4, 46	pm3.2i 272	. . . . . . 7 |- ( pi e. RR /\ 0 < pi )
48		ltdiv2 9161	. . . . . . 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 9150	. . . . . 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 8341	. . . . 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 8331	. . . . . 6 |- pi e. RR*
59		0re 8274	. . . . . . 7 |- 0 e. RR
60	59, 4, 46	ltleii 8376	. . . . . 6 |- 0 <_ pi
61		lbicc2 10317	. . . . . 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 8275	. . . . . 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 8392	. . . . 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 8392	. . . . 5 |- ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ A < pi ) -> A <_ pi )
72	59, 4	elicc2i 10272	. . . . 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 15714	. . 3 |- ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ A < pi ) -> ( cos ` A ) < ( cos ` 0 ) )
75		cos0 12416	. . 3 |- ( cos ` 0 ) = 1
76	74, 75	breqtrdi 4150	. 2 |- ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ A < pi ) -> ( cos ` A ) < 1 )
77		pirp 15654	. . . 4 |- pi e. RR+
78		rphalflt 10016	. . . 4 |- ( pi e. RR+ -> ( pi / 2 ) < pi )
79	77, 78	ax-mp 5	. . 3 |- ( pi / 2 ) < pi
80		axltwlin 8341	. . . 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 2203   class class class wbr 4109   ` cfv 5352  (class class class)co 6050   RRcr 8126   0cc0 8127   1c1 8128   x. cmul 8132   RR*cxr 8307   < clt 8308   <_ cle 8309   / cdiv 8946   2c2 9288   3c3 9289   RR+crp 9986   (,)cioo 10221   [,)cico 10223   [,]cicc 10224   cosccos 12331   picpi 12333

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 2205  ax-14 2206  ax-ext 2214  ax-coll 4225  ax-sep 4228  ax-nul 4236  ax-pow 4287  ax-pr 4322  ax-un 4554  ax-setind 4659  ax-iinf 4710  ax-cnex 8218  ax-resscn 8219  ax-1cn 8220  ax-1re 8221  ax-icn 8222  ax-addcl 8223  ax-addrcl 8224  ax-mulcl 8225  ax-mulrcl 8226  ax-addcom 8227  ax-mulcom 8228  ax-addass 8229  ax-mulass 8230  ax-distr 8231  ax-i2m1 8232  ax-0lt1 8233  ax-1rid 8234  ax-0id 8235  ax-rnegex 8236  ax-precex 8237  ax-cnre 8238  ax-pre-ltirr 8239  ax-pre-ltwlin 8240  ax-pre-lttrn 8241  ax-pre-apti 8242  ax-pre-ltadd 8243  ax-pre-mulgt0 8244  ax-pre-mulext 8245  ax-arch 8246  ax-caucvg 8247  ax-pre-suploc 8248  ax-addf 8249  ax-mulf 8250

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 2083  df-mo 2084  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ne 2413  df-nel 2508  df-ral 2525  df-rex 2526  df-reu 2527  df-rmo 2528  df-rab 2529  df-v 2815  df-sbc 3043  df-csb 3139  df-dif 3213  df-un 3215  df-in 3217  df-ss 3224  df-nul 3509  df-if 3621  df-pw 3671  df-sn 3695  df-pr 3696  df-op 3698  df-uni 3915  df-int 3950  df-iun 3993  df-disj 4086  df-br 4110  df-opab 4172  df-mpt 4173  df-tr 4209  df-id 4414  df-po 4417  df-iso 4418  df-iord 4487  df-on 4489  df-ilim 4490  df-suc 4492  df-iom 4713  df-xp 4755  df-rel 4756  df-cnv 4757  df-co 4758  df-dm 4759  df-rn 4760  df-res 4761  df-ima 4762  df-iota 5312  df-fun 5354  df-fn 5355  df-f 5356  df-f1 5357  df-fo 5358  df-f1o 5359  df-fv 5360  df-isom 5361  df-riota 6003  df-ov 6053  df-oprab 6054  df-mpo 6055  df-of 6266  df-1st 6334  df-2nd 6335  df-recs 6536  df-irdg 6601  df-frec 6622  df-1o 6647  df-oadd 6651  df-er 6767  df-map 6884  df-pm 6885  df-en 6976  df-dom 6977  df-fin 6978  df-sup 7275  df-inf 7276  df-pnf 8310  df-mnf 8311  df-xr 8312  df-ltxr 8313  df-le 8314  df-sub 8446  df-neg 8447  df-reap 8849  df-ap 8856  df-div 8947  df-inn 9238  df-2 9296  df-3 9297  df-4 9298  df-5 9299  df-6 9300  df-7 9301  df-8 9302  df-9 9303  df-n0 9497  df-z 9578  df-uz 9854  df-q 9952  df-rp 9987  df-xneg 10105  df-xadd 10106  df-ioo 10225  df-ioc 10226  df-ico 10227  df-icc 10228  df-fz 10343  df-fzo 10477  df-seqfrec 10810  df-exp 10901  df-fac 11088  df-bc 11110  df-ihash 11139  df-shft 11500  df-cj 11527  df-re 11528  df-im 11529  df-rsqrt 11683  df-abs 11684  df-clim 11964  df-sumdc 12039  df-ef 12334  df-sin 12336  df-cos 12337  df-pi 12339  df-rest 13454  df-topgen 13473  df-psmet 14691  df-xmet 14692  df-met 14693  df-bl 14694  df-mopn 14695  df-top 14863  df-topon 14876  df-bases 14908  df-ntr 14961  df-cn 15053  df-cnp 15054  df-tx 15118  df-cncf 15436  df-limced 15521  df-dvap 15522

This theorem is referenced by:  cos0pilt1  15717  taupi  16859