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Mirrors > Home > MPE Home > Th. List > sincosq1sgn | Structured version Visualization version GIF version |
Description: The signs of the sine and cosine functions in the first quadrant. (Contributed by Paul Chapman, 24-Jan-2008.) |
Ref | Expression |
---|---|
sincosq1sgn | ⊢ (𝐴 ∈ (0(,)(π / 2)) → (0 < (sin‘𝐴) ∧ 0 < (cos‘𝐴))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 0xr 10688 | . . 3 ⊢ 0 ∈ ℝ* | |
2 | halfpire 25050 | . . . 4 ⊢ (π / 2) ∈ ℝ | |
3 | 2 | rexri 10699 | . . 3 ⊢ (π / 2) ∈ ℝ* |
4 | elioo2 12780 | . . 3 ⊢ ((0 ∈ ℝ* ∧ (π / 2) ∈ ℝ*) → (𝐴 ∈ (0(,)(π / 2)) ↔ (𝐴 ∈ ℝ ∧ 0 < 𝐴 ∧ 𝐴 < (π / 2)))) | |
5 | 1, 3, 4 | mp2an 690 | . 2 ⊢ (𝐴 ∈ (0(,)(π / 2)) ↔ (𝐴 ∈ ℝ ∧ 0 < 𝐴 ∧ 𝐴 < (π / 2))) |
6 | sincosq1lem 25083 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 0 < 𝐴 ∧ 𝐴 < (π / 2)) → 0 < (sin‘𝐴)) | |
7 | resubcl 10950 | . . . . . . . 8 ⊢ (((π / 2) ∈ ℝ ∧ 𝐴 ∈ ℝ) → ((π / 2) − 𝐴) ∈ ℝ) | |
8 | 2, 7 | mpan 688 | . . . . . . 7 ⊢ (𝐴 ∈ ℝ → ((π / 2) − 𝐴) ∈ ℝ) |
9 | sincosq1lem 25083 | . . . . . . 7 ⊢ ((((π / 2) − 𝐴) ∈ ℝ ∧ 0 < ((π / 2) − 𝐴) ∧ ((π / 2) − 𝐴) < (π / 2)) → 0 < (sin‘((π / 2) − 𝐴))) | |
10 | 8, 9 | syl3an1 1159 | . . . . . 6 ⊢ ((𝐴 ∈ ℝ ∧ 0 < ((π / 2) − 𝐴) ∧ ((π / 2) − 𝐴) < (π / 2)) → 0 < (sin‘((π / 2) − 𝐴))) |
11 | 10 | 3expib 1118 | . . . . 5 ⊢ (𝐴 ∈ ℝ → ((0 < ((π / 2) − 𝐴) ∧ ((π / 2) − 𝐴) < (π / 2)) → 0 < (sin‘((π / 2) − 𝐴)))) |
12 | 0re 10643 | . . . . . . . . 9 ⊢ 0 ∈ ℝ | |
13 | ltsub13 11121 | . . . . . . . . 9 ⊢ ((0 ∈ ℝ ∧ (π / 2) ∈ ℝ ∧ 𝐴 ∈ ℝ) → (0 < ((π / 2) − 𝐴) ↔ 𝐴 < ((π / 2) − 0))) | |
14 | 12, 2, 13 | mp3an12 1447 | . . . . . . . 8 ⊢ (𝐴 ∈ ℝ → (0 < ((π / 2) − 𝐴) ↔ 𝐴 < ((π / 2) − 0))) |
15 | 2 | recni 10655 | . . . . . . . . . 10 ⊢ (π / 2) ∈ ℂ |
16 | 15 | subid1i 10958 | . . . . . . . . 9 ⊢ ((π / 2) − 0) = (π / 2) |
17 | 16 | breq2i 5074 | . . . . . . . 8 ⊢ (𝐴 < ((π / 2) − 0) ↔ 𝐴 < (π / 2)) |
18 | 14, 17 | syl6bb 289 | . . . . . . 7 ⊢ (𝐴 ∈ ℝ → (0 < ((π / 2) − 𝐴) ↔ 𝐴 < (π / 2))) |
19 | ltsub23 11120 | . . . . . . . . 9 ⊢ (((π / 2) ∈ ℝ ∧ 𝐴 ∈ ℝ ∧ (π / 2) ∈ ℝ) → (((π / 2) − 𝐴) < (π / 2) ↔ ((π / 2) − (π / 2)) < 𝐴)) | |
20 | 2, 2, 19 | mp3an13 1448 | . . . . . . . 8 ⊢ (𝐴 ∈ ℝ → (((π / 2) − 𝐴) < (π / 2) ↔ ((π / 2) − (π / 2)) < 𝐴)) |
21 | 15 | subidi 10957 | . . . . . . . . 9 ⊢ ((π / 2) − (π / 2)) = 0 |
22 | 21 | breq1i 5073 | . . . . . . . 8 ⊢ (((π / 2) − (π / 2)) < 𝐴 ↔ 0 < 𝐴) |
23 | 20, 22 | syl6bb 289 | . . . . . . 7 ⊢ (𝐴 ∈ ℝ → (((π / 2) − 𝐴) < (π / 2) ↔ 0 < 𝐴)) |
24 | 18, 23 | anbi12d 632 | . . . . . 6 ⊢ (𝐴 ∈ ℝ → ((0 < ((π / 2) − 𝐴) ∧ ((π / 2) − 𝐴) < (π / 2)) ↔ (𝐴 < (π / 2) ∧ 0 < 𝐴))) |
25 | 24 | biancomd 466 | . . . . 5 ⊢ (𝐴 ∈ ℝ → ((0 < ((π / 2) − 𝐴) ∧ ((π / 2) − 𝐴) < (π / 2)) ↔ (0 < 𝐴 ∧ 𝐴 < (π / 2)))) |
26 | recn 10627 | . . . . . . 7 ⊢ (𝐴 ∈ ℝ → 𝐴 ∈ ℂ) | |
27 | sinhalfpim 25079 | . . . . . . 7 ⊢ (𝐴 ∈ ℂ → (sin‘((π / 2) − 𝐴)) = (cos‘𝐴)) | |
28 | 26, 27 | syl 17 | . . . . . 6 ⊢ (𝐴 ∈ ℝ → (sin‘((π / 2) − 𝐴)) = (cos‘𝐴)) |
29 | 28 | breq2d 5078 | . . . . 5 ⊢ (𝐴 ∈ ℝ → (0 < (sin‘((π / 2) − 𝐴)) ↔ 0 < (cos‘𝐴))) |
30 | 11, 25, 29 | 3imtr3d 295 | . . . 4 ⊢ (𝐴 ∈ ℝ → ((0 < 𝐴 ∧ 𝐴 < (π / 2)) → 0 < (cos‘𝐴))) |
31 | 30 | 3impib 1112 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 0 < 𝐴 ∧ 𝐴 < (π / 2)) → 0 < (cos‘𝐴)) |
32 | 6, 31 | jca 514 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 0 < 𝐴 ∧ 𝐴 < (π / 2)) → (0 < (sin‘𝐴) ∧ 0 < (cos‘𝐴))) |
33 | 5, 32 | sylbi 219 | 1 ⊢ (𝐴 ∈ (0(,)(π / 2)) → (0 < (sin‘𝐴) ∧ 0 < (cos‘𝐴))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 208 ∧ wa 398 ∧ w3a 1083 = wceq 1537 ∈ wcel 2114 class class class wbr 5066 ‘cfv 6355 (class class class)co 7156 ℂcc 10535 ℝcr 10536 0cc0 10537 ℝ*cxr 10674 < clt 10675 − cmin 10870 / cdiv 11297 2c2 11693 (,)cioo 12739 sincsin 15417 cosccos 15418 πcpi 15420 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-rep 5190 ax-sep 5203 ax-nul 5210 ax-pow 5266 ax-pr 5330 ax-un 7461 ax-inf2 9104 ax-cnex 10593 ax-resscn 10594 ax-1cn 10595 ax-icn 10596 ax-addcl 10597 ax-addrcl 10598 ax-mulcl 10599 ax-mulrcl 10600 ax-mulcom 10601 ax-addass 10602 ax-mulass 10603 ax-distr 10604 ax-i2m1 10605 ax-1ne0 10606 ax-1rid 10607 ax-rnegex 10608 ax-rrecex 10609 ax-cnre 10610 ax-pre-lttri 10611 ax-pre-lttrn 10612 ax-pre-ltadd 10613 ax-pre-mulgt0 10614 ax-pre-sup 10615 ax-addf 10616 ax-mulf 10617 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-fal 1550 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-nel 3124 df-ral 3143 df-rex 3144 df-reu 3145 df-rmo 3146 df-rab 3147 df-v 3496 df-sbc 3773 df-csb 3884 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-pss 3954 df-nul 4292 df-if 4468 df-pw 4541 df-sn 4568 df-pr 4570 df-tp 4572 df-op 4574 df-uni 4839 df-int 4877 df-iun 4921 df-iin 4922 df-br 5067 df-opab 5129 df-mpt 5147 df-tr 5173 df-id 5460 df-eprel 5465 df-po 5474 df-so 5475 df-fr 5514 df-se 5515 df-we 5516 df-xp 5561 df-rel 5562 df-cnv 5563 df-co 5564 df-dm 5565 df-rn 5566 df-res 5567 df-ima 5568 df-pred 6148 df-ord 6194 df-on 6195 df-lim 6196 df-suc 6197 df-iota 6314 df-fun 6357 df-fn 6358 df-f 6359 df-f1 6360 df-fo 6361 df-f1o 6362 df-fv 6363 df-isom 6364 df-riota 7114 df-ov 7159 df-oprab 7160 df-mpo 7161 df-of 7409 df-om 7581 df-1st 7689 df-2nd 7690 df-supp 7831 df-wrecs 7947 df-recs 8008 df-rdg 8046 df-1o 8102 df-2o 8103 df-oadd 8106 df-er 8289 df-map 8408 df-pm 8409 df-ixp 8462 df-en 8510 df-dom 8511 df-sdom 8512 df-fin 8513 df-fsupp 8834 df-fi 8875 df-sup 8906 df-inf 8907 df-oi 8974 df-card 9368 df-pnf 10677 df-mnf 10678 df-xr 10679 df-ltxr 10680 df-le 10681 df-sub 10872 df-neg 10873 df-div 11298 df-nn 11639 df-2 11701 df-3 11702 df-4 11703 df-5 11704 df-6 11705 df-7 11706 df-8 11707 df-9 11708 df-n0 11899 df-z 11983 df-dec 12100 df-uz 12245 df-q 12350 df-rp 12391 df-xneg 12508 df-xadd 12509 df-xmul 12510 df-ioo 12743 df-ioc 12744 df-ico 12745 df-icc 12746 df-fz 12894 df-fzo 13035 df-fl 13163 df-seq 13371 df-exp 13431 df-fac 13635 df-bc 13664 df-hash 13692 df-shft 14426 df-cj 14458 df-re 14459 df-im 14460 df-sqrt 14594 df-abs 14595 df-limsup 14828 df-clim 14845 df-rlim 14846 df-sum 15043 df-ef 15421 df-sin 15423 df-cos 15424 df-pi 15426 df-struct 16485 df-ndx 16486 df-slot 16487 df-base 16489 df-sets 16490 df-ress 16491 df-plusg 16578 df-mulr 16579 df-starv 16580 df-sca 16581 df-vsca 16582 df-ip 16583 df-tset 16584 df-ple 16585 df-ds 16587 df-unif 16588 df-hom 16589 df-cco 16590 df-rest 16696 df-topn 16697 df-0g 16715 df-gsum 16716 df-topgen 16717 df-pt 16718 df-prds 16721 df-xrs 16775 df-qtop 16780 df-imas 16781 df-xps 16783 df-mre 16857 df-mrc 16858 df-acs 16860 df-mgm 17852 df-sgrp 17901 df-mnd 17912 df-submnd 17957 df-mulg 18225 df-cntz 18447 df-cmn 18908 df-psmet 20537 df-xmet 20538 df-met 20539 df-bl 20540 df-mopn 20541 df-fbas 20542 df-fg 20543 df-cnfld 20546 df-top 21502 df-topon 21519 df-topsp 21541 df-bases 21554 df-cld 21627 df-ntr 21628 df-cls 21629 df-nei 21706 df-lp 21744 df-perf 21745 df-cn 21835 df-cnp 21836 df-haus 21923 df-tx 22170 df-hmeo 22363 df-fil 22454 df-fm 22546 df-flim 22547 df-flf 22548 df-xms 22930 df-ms 22931 df-tms 22932 df-cncf 23486 df-limc 24464 df-dv 24465 |
This theorem is referenced by: sincosq2sgn 25085 coseq00topi 25088 tanrpcl 25090 tangtx 25091 tanabsge 25092 sincos6thpi 25101 tanord1 25121 basellem3 25660 basellem4 25661 basellem8 25665 |
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