Theorem cos02pilt1 15438

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 10069	. . . . . . 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 15373	. . . . . . 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 8226	. . . . 5 |- ( ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ ( pi / 2 ) < A ) /\ pi < A ) -> pi <_ A )
8		0xr 8154	. . . . . . . 8 |- 0 e. RR*
9		2re 9141	. . . . . . . . . 10 |- 2 e. RR
10	9, 4	remulcli 8121	. . . . . . . . 9 |- ( 2 x. pi ) e. RR
11	10	rexri 8165	. . . . . . . 8 |- ( 2 x. pi ) e. RR*
12		elioo2 10078	. . . . . . . 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 1017	. . . . . 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 10094	. . . . . 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 1184	. . . 4 |- ( ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ ( pi / 2 ) < A ) /\ pi < A ) -> A e. ( pi [,) ( 2 x. pi ) ) )
19		cosq34lt1 15437	. . . 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 528	. . . . 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 15379	. . . . . . 7 |- ( pi / 2 ) e. RR
25	24	rexri 8165	. . . . . 6 |- ( pi / 2 ) e. RR*
26		3re 9145	. . . . . . . 8 |- 3 e. RR
27	26, 24	remulcli 8121	. . . . . . 7 |- ( 3 x. ( pi / 2 ) ) e. RR
28	27	rexri 8165	. . . . . 6 |- ( 3 x. ( pi / 2 ) ) e. RR*
29		elioo2 10078	. . . . . 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 1184	. . . 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 10069	. . . . . 6 |- ( A e. ( ( pi / 2 ) (,) ( 3 x. ( pi / 2 ) ) ) -> A e. RR )
33	32	recoscld 12150	. . . . 5 |- ( A e. ( ( pi / 2 ) (,) ( 3 x. ( pi / 2 ) ) ) -> ( cos ` A ) e. RR )
34		0red 8108	. . . . 5 |- ( A e. ( ( pi / 2 ) (,) ( 3 x. ( pi / 2 ) ) ) -> 0 e. RR )
35		1red 8122	. . . . 5 |- ( A e. ( ( pi / 2 ) (,) ( 3 x. ( pi / 2 ) ) ) -> 1 e. RR )
36		cosq23lt0 15420	. . . . 5 |- ( A e. ( ( pi / 2 ) (,) ( 3 x. ( pi / 2 ) ) ) -> ( cos ` A ) < 0 )
37		0lt1 8234	. . . . . 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 8233	. . . 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 9242	. . . . . 6 |- 2 < 3
42		2pos 9162	. . . . . . . 8 |- 0 < 2
43	9, 42	pm3.2i 272	. . . . . . 7 |- ( 2 e. RR /\ 0 < 2 )
44		3pos 9165	. . . . . . . 8 |- 0 < 3
45	26, 44	pm3.2i 272	. . . . . . 7 |- ( 3 e. RR /\ 0 < 3 )
46		pipos 15375	. . . . . . . 8 |- 0 < pi
47	4, 46	pm3.2i 272	. . . . . . 7 |- ( pi e. RR /\ 0 < pi )
48		ltdiv2 8995	. . . . . . 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 1350	. . . . . 6 |- ( 2 < 3 <-> ( pi / 3 ) < ( pi / 2 ) )
50	41, 49	mpbi 145	. . . . 5 |- ( pi / 3 ) < ( pi / 2 )
51		ltdivmul 8984	. . . . . 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 1350	. . . . 5 |- ( ( pi / 3 ) < ( pi / 2 ) <-> pi < ( 3 x. ( pi / 2 ) ) )
53	50, 52	mpbi 145	. . . 4 |- pi < ( 3 x. ( pi / 2 ) )
54		axltwlin 8175	. . . . 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 1354	. . . 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 800	. 2 |- ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ ( pi / 2 ) < A ) -> ( cos ` A ) < 1 )
58	4	rexri 8165	. . . . . 6 |- pi e. RR*
59		0re 8107	. . . . . . 7 |- 0 e. RR
60	59, 4, 46	ltleii 8210	. . . . . 6 |- 0 <_ pi
61		lbicc2 10141	. . . . . 6 |- ( ( 0 e. RR* /\ pi e. RR* /\ 0 <_ pi ) -> 0 e. ( 0 [,] pi ) )
62	8, 58, 60, 61	mp3an 1350	. . . . 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 8108	. . . . . 6 |- ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ A < pi ) -> 0 e. RR )
66	13	simp2bi 1016	. . . . . . 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 8226	. . . . 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 8226	. . . . 5 |- ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ A < pi ) -> A <_ pi )
72	59, 4	elicc2i 10096	. . . . 5 |- ( A e. ( 0 [,] pi ) <-> ( A e. RR /\ 0 <_ A /\ A <_ pi ) )
73	64, 68, 71, 72	syl3anbrc 1184	. . . 4 |- ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ A < pi ) -> A e. ( 0 [,] pi ) )
74	63, 73, 67	cosordlem 15436	. . 3 |- ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ A < pi ) -> ( cos ` A ) < ( cos ` 0 ) )
75		cos0 12156	. . 3 |- ( cos ` 0 ) = 1
76	74, 75	breqtrdi 4100	. 2 |- ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ A < pi ) -> ( cos ` A ) < 1 )
77		pirp 15376	. . . 4 |- pi e. RR+
78		rphalflt 9840	. . . 4 |- ( pi e. RR+ -> ( pi / 2 ) < pi )
79	77, 78	ax-mp 5	. . 3 |- ( pi / 2 ) < pi
80		axltwlin 8175	. . . 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 1354	. . 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 800	1 |- ( A e. ( 0 (,) ( 2 x. pi ) ) -> ( cos ` A ) < 1 )

Syntax hints:   -> wi 4   /\ wa 104   <-> wb 105   \/ wo 710   /\ w3a 981   e. wcel 2178   class class class wbr 4059   ` cfv 5290  (class class class)co 5967   RRcr 7959   0cc0 7960   1c1 7961   x. cmul 7965   RR*cxr 8141   < clt 8142   <_ cle 8143   / cdiv 8780   2c2 9122   3c3 9123   RR+crp 9810   (,)cioo 10045   [,)cico 10047   [,]cicc 10048   cosccos 12071   picpi 12073

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 615  ax-in2 616  ax-io 711  ax-5 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-bndl 1533  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-13 2180  ax-14 2181  ax-ext 2189  ax-coll 4175  ax-sep 4178  ax-nul 4186  ax-pow 4234  ax-pr 4269  ax-un 4498  ax-setind 4603  ax-iinf 4654  ax-cnex 8051  ax-resscn 8052  ax-1cn 8053  ax-1re 8054  ax-icn 8055  ax-addcl 8056  ax-addrcl 8057  ax-mulcl 8058  ax-mulrcl 8059  ax-addcom 8060  ax-mulcom 8061  ax-addass 8062  ax-mulass 8063  ax-distr 8064  ax-i2m1 8065  ax-0lt1 8066  ax-1rid 8067  ax-0id 8068  ax-rnegex 8069  ax-precex 8070  ax-cnre 8071  ax-pre-ltirr 8072  ax-pre-ltwlin 8073  ax-pre-lttrn 8074  ax-pre-apti 8075  ax-pre-ltadd 8076  ax-pre-mulgt0 8077  ax-pre-mulext 8078  ax-arch 8079  ax-caucvg 8080  ax-pre-suploc 8081  ax-addf 8082  ax-mulf 8083

This theorem depends on definitions:  df-bi 117  df-stab 833  df-dc 837  df-3or 982  df-3an 983  df-tru 1376  df-fal 1379  df-nf 1485  df-sb 1787  df-eu 2058  df-mo 2059  df-clab 2194  df-cleq 2200  df-clel 2203  df-nfc 2339  df-ne 2379  df-nel 2474  df-ral 2491  df-rex 2492  df-reu 2493  df-rmo 2494  df-rab 2495  df-v 2778  df-sbc 3006  df-csb 3102  df-dif 3176  df-un 3178  df-in 3180  df-ss 3187  df-nul 3469  df-if 3580  df-pw 3628  df-sn 3649  df-pr 3650  df-op 3652  df-uni 3865  df-int 3900  df-iun 3943  df-disj 4036  df-br 4060  df-opab 4122  df-mpt 4123  df-tr 4159  df-id 4358  df-po 4361  df-iso 4362  df-iord 4431  df-on 4433  df-ilim 4434  df-suc 4436  df-iom 4657  df-xp 4699  df-rel 4700  df-cnv 4701  df-co 4702  df-dm 4703  df-rn 4704  df-res 4705  df-ima 4706  df-iota 5251  df-fun 5292  df-fn 5293  df-f 5294  df-f1 5295  df-fo 5296  df-f1o 5297  df-fv 5298  df-isom 5299  df-riota 5922  df-ov 5970  df-oprab 5971  df-mpo 5972  df-of 6181  df-1st 6249  df-2nd 6250  df-recs 6414  df-irdg 6479  df-frec 6500  df-1o 6525  df-oadd 6529  df-er 6643  df-map 6760  df-pm 6761  df-en 6851  df-dom 6852  df-fin 6853  df-sup 7112  df-inf 7113  df-pnf 8144  df-mnf 8145  df-xr 8146  df-ltxr 8147  df-le 8148  df-sub 8280  df-neg 8281  df-reap 8683  df-ap 8690  df-div 8781  df-inn 9072  df-2 9130  df-3 9131  df-4 9132  df-5 9133  df-6 9134  df-7 9135  df-8 9136  df-9 9137  df-n0 9331  df-z 9408  df-uz 9684  df-q 9776  df-rp 9811  df-xneg 9929  df-xadd 9930  df-ioo 10049  df-ioc 10050  df-ico 10051  df-icc 10052  df-fz 10166  df-fzo 10300  df-seqfrec 10630  df-exp 10721  df-fac 10908  df-bc 10930  df-ihash 10958  df-shft 11241  df-cj 11268  df-re 11269  df-im 11270  df-rsqrt 11424  df-abs 11425  df-clim 11705  df-sumdc 11780  df-ef 12074  df-sin 12076  df-cos 12077  df-pi 12079  df-rest 13188  df-topgen 13207  df-psmet 14420  df-xmet 14421  df-met 14422  df-bl 14423  df-mopn 14424  df-top 14585  df-topon 14598  df-bases 14630  df-ntr 14683  df-cn 14775  df-cnp 14776  df-tx 14840  df-cncf 15158  df-limced 15243  df-dvap 15244

This theorem is referenced by:  cos0pilt1  15439  taupi  16214