Theorem cos02pilt1 15540

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 10120	. . . . . . 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 15475	. . . . . . 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 8276	. . . . 5 |- ( ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ ( pi / 2 ) < A ) /\ pi < A ) -> pi <_ A )
8		0xr 8204	. . . . . . . 8 |- 0 e. RR*
9		2re 9191	. . . . . . . . . 10 |- 2 e. RR
10	9, 4	remulcli 8171	. . . . . . . . 9 |- ( 2 x. pi ) e. RR
11	10	rexri 8215	. . . . . . . 8 |- ( 2 x. pi ) e. RR*
12		elioo2 10129	. . . . . . . 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 1038	. . . . . 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 10145	. . . . . 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 1205	. . . 4 |- ( ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ ( pi / 2 ) < A ) /\ pi < A ) -> A e. ( pi [,) ( 2 x. pi ) ) )
19		cosq34lt1 15539	. . . 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 15481	. . . . . . 7 |- ( pi / 2 ) e. RR
25	24	rexri 8215	. . . . . 6 |- ( pi / 2 ) e. RR*
26		3re 9195	. . . . . . . 8 |- 3 e. RR
27	26, 24	remulcli 8171	. . . . . . 7 |- ( 3 x. ( pi / 2 ) ) e. RR
28	27	rexri 8215	. . . . . 6 |- ( 3 x. ( pi / 2 ) ) e. RR*
29		elioo2 10129	. . . . . 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 1205	. . . 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 10120	. . . . . 6 |- ( A e. ( ( pi / 2 ) (,) ( 3 x. ( pi / 2 ) ) ) -> A e. RR )
33	32	recoscld 12250	. . . . 5 |- ( A e. ( ( pi / 2 ) (,) ( 3 x. ( pi / 2 ) ) ) -> ( cos ` A ) e. RR )
34		0red 8158	. . . . 5 |- ( A e. ( ( pi / 2 ) (,) ( 3 x. ( pi / 2 ) ) ) -> 0 e. RR )
35		1red 8172	. . . . 5 |- ( A e. ( ( pi / 2 ) (,) ( 3 x. ( pi / 2 ) ) ) -> 1 e. RR )
36		cosq23lt0 15522	. . . . 5 |- ( A e. ( ( pi / 2 ) (,) ( 3 x. ( pi / 2 ) ) ) -> ( cos ` A ) < 0 )
37		0lt1 8284	. . . . . 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 8283	. . . 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 9292	. . . . . 6 |- 2 < 3
42		2pos 9212	. . . . . . . 8 |- 0 < 2
43	9, 42	pm3.2i 272	. . . . . . 7 |- ( 2 e. RR /\ 0 < 2 )
44		3pos 9215	. . . . . . . 8 |- 0 < 3
45	26, 44	pm3.2i 272	. . . . . . 7 |- ( 3 e. RR /\ 0 < 3 )
46		pipos 15477	. . . . . . . 8 |- 0 < pi
47	4, 46	pm3.2i 272	. . . . . . 7 |- ( pi e. RR /\ 0 < pi )
48		ltdiv2 9045	. . . . . . 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 1371	. . . . . 6 |- ( 2 < 3 <-> ( pi / 3 ) < ( pi / 2 ) )
50	41, 49	mpbi 145	. . . . 5 |- ( pi / 3 ) < ( pi / 2 )
51		ltdivmul 9034	. . . . . 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 1371	. . . . 5 |- ( ( pi / 3 ) < ( pi / 2 ) <-> pi < ( 3 x. ( pi / 2 ) ) )
53	50, 52	mpbi 145	. . . 4 |- pi < ( 3 x. ( pi / 2 ) )
54		axltwlin 8225	. . . . 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 1375	. . . 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 803	. 2 |- ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ ( pi / 2 ) < A ) -> ( cos ` A ) < 1 )
58	4	rexri 8215	. . . . . 6 |- pi e. RR*
59		0re 8157	. . . . . . 7 |- 0 e. RR
60	59, 4, 46	ltleii 8260	. . . . . 6 |- 0 <_ pi
61		lbicc2 10192	. . . . . 6 |- ( ( 0 e. RR* /\ pi e. RR* /\ 0 <_ pi ) -> 0 e. ( 0 [,] pi ) )
62	8, 58, 60, 61	mp3an 1371	. . . . 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 8158	. . . . . 6 |- ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ A < pi ) -> 0 e. RR )
66	13	simp2bi 1037	. . . . . . 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 8276	. . . . 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 8276	. . . . 5 |- ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ A < pi ) -> A <_ pi )
72	59, 4	elicc2i 10147	. . . . 5 |- ( A e. ( 0 [,] pi ) <-> ( A e. RR /\ 0 <_ A /\ A <_ pi ) )
73	64, 68, 71, 72	syl3anbrc 1205	. . . 4 |- ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ A < pi ) -> A e. ( 0 [,] pi ) )
74	63, 73, 67	cosordlem 15538	. . 3 |- ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ A < pi ) -> ( cos ` A ) < ( cos ` 0 ) )
75		cos0 12256	. . 3 |- ( cos ` 0 ) = 1
76	74, 75	breqtrdi 4124	. 2 |- ( ( A e. ( 0 (,) ( 2 x. pi ) ) /\ A < pi ) -> ( cos ` A ) < 1 )
77		pirp 15478	. . . 4 |- pi e. RR+
78		rphalflt 9891	. . . 4 |- ( pi e. RR+ -> ( pi / 2 ) < pi )
79	77, 78	ax-mp 5	. . 3 |- ( pi / 2 ) < pi
80		axltwlin 8225	. . . 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 1375	. . 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 803	1 |- ( A e. ( 0 (,) ( 2 x. pi ) ) -> ( cos ` A ) < 1 )

Syntax hints:   -> wi 4   /\ wa 104   <-> wb 105   \/ wo 713   /\ w3a 1002   e. wcel 2200   class class class wbr 4083   ` cfv 5318  (class class class)co 6007   RRcr 8009   0cc0 8010   1c1 8011   x. cmul 8015   RR*cxr 8191   < clt 8192   <_ cle 8193   / cdiv 8830   2c2 9172   3c3 9173   RR+crp 9861   (,)cioo 10096   [,)cico 10098   [,]cicc 10099   cosccos 12171   picpi 12173

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 617  ax-in2 618  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-13 2202  ax-14 2203  ax-ext 2211  ax-coll 4199  ax-sep 4202  ax-nul 4210  ax-pow 4258  ax-pr 4293  ax-un 4524  ax-setind 4629  ax-iinf 4680  ax-cnex 8101  ax-resscn 8102  ax-1cn 8103  ax-1re 8104  ax-icn 8105  ax-addcl 8106  ax-addrcl 8107  ax-mulcl 8108  ax-mulrcl 8109  ax-addcom 8110  ax-mulcom 8111  ax-addass 8112  ax-mulass 8113  ax-distr 8114  ax-i2m1 8115  ax-0lt1 8116  ax-1rid 8117  ax-0id 8118  ax-rnegex 8119  ax-precex 8120  ax-cnre 8121  ax-pre-ltirr 8122  ax-pre-ltwlin 8123  ax-pre-lttrn 8124  ax-pre-apti 8125  ax-pre-ltadd 8126  ax-pre-mulgt0 8127  ax-pre-mulext 8128  ax-arch 8129  ax-caucvg 8130  ax-pre-suploc 8131  ax-addf 8132  ax-mulf 8133

This theorem depends on definitions:  df-bi 117  df-stab 836  df-dc 840  df-3or 1003  df-3an 1004  df-tru 1398  df-fal 1401  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ne 2401  df-nel 2496  df-ral 2513  df-rex 2514  df-reu 2515  df-rmo 2516  df-rab 2517  df-v 2801  df-sbc 3029  df-csb 3125  df-dif 3199  df-un 3201  df-in 3203  df-ss 3210  df-nul 3492  df-if 3603  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-uni 3889  df-int 3924  df-iun 3967  df-disj 4060  df-br 4084  df-opab 4146  df-mpt 4147  df-tr 4183  df-id 4384  df-po 4387  df-iso 4388  df-iord 4457  df-on 4459  df-ilim 4460  df-suc 4462  df-iom 4683  df-xp 4725  df-rel 4726  df-cnv 4727  df-co 4728  df-dm 4729  df-rn 4730  df-res 4731  df-ima 4732  df-iota 5278  df-fun 5320  df-fn 5321  df-f 5322  df-f1 5323  df-fo 5324  df-f1o 5325  df-fv 5326  df-isom 5327  df-riota 5960  df-ov 6010  df-oprab 6011  df-mpo 6012  df-of 6224  df-1st 6292  df-2nd 6293  df-recs 6457  df-irdg 6522  df-frec 6543  df-1o 6568  df-oadd 6572  df-er 6688  df-map 6805  df-pm 6806  df-en 6896  df-dom 6897  df-fin 6898  df-sup 7162  df-inf 7163  df-pnf 8194  df-mnf 8195  df-xr 8196  df-ltxr 8197  df-le 8198  df-sub 8330  df-neg 8331  df-reap 8733  df-ap 8740  df-div 8831  df-inn 9122  df-2 9180  df-3 9181  df-4 9182  df-5 9183  df-6 9184  df-7 9185  df-8 9186  df-9 9187  df-n0 9381  df-z 9458  df-uz 9734  df-q 9827  df-rp 9862  df-xneg 9980  df-xadd 9981  df-ioo 10100  df-ioc 10101  df-ico 10102  df-icc 10103  df-fz 10217  df-fzo 10351  df-seqfrec 10682  df-exp 10773  df-fac 10960  df-bc 10982  df-ihash 11010  df-shft 11341  df-cj 11368  df-re 11369  df-im 11370  df-rsqrt 11524  df-abs 11525  df-clim 11805  df-sumdc 11880  df-ef 12174  df-sin 12176  df-cos 12177  df-pi 12179  df-rest 13289  df-topgen 13308  df-psmet 14522  df-xmet 14523  df-met 14524  df-bl 14525  df-mopn 14526  df-top 14687  df-topon 14700  df-bases 14732  df-ntr 14785  df-cn 14877  df-cnp 14878  df-tx 14942  df-cncf 15260  df-limced 15345  df-dvap 15346

This theorem is referenced by:  cos0pilt1  15541  taupi  16501