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Mirrors > Home > MPE Home > Th. List > sincos2sgn | Structured version Visualization version GIF version |
Description: The signs of the sine and cosine of 2. (Contributed by Paul Chapman, 19-Jan-2008.) |
Ref | Expression |
---|---|
sincos2sgn | ⊢ (0 < (sin‘2) ∧ (cos‘2) < 0) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 2re 11699 | . . . 4 ⊢ 2 ∈ ℝ | |
2 | 2pos 11728 | . . . 4 ⊢ 0 < 2 | |
3 | 1 | leidi 11163 | . . . 4 ⊢ 2 ≤ 2 |
4 | 0xr 10677 | . . . . 5 ⊢ 0 ∈ ℝ* | |
5 | elioc2 12788 | . . . . 5 ⊢ ((0 ∈ ℝ* ∧ 2 ∈ ℝ) → (2 ∈ (0(,]2) ↔ (2 ∈ ℝ ∧ 0 < 2 ∧ 2 ≤ 2))) | |
6 | 4, 1, 5 | mp2an 691 | . . . 4 ⊢ (2 ∈ (0(,]2) ↔ (2 ∈ ℝ ∧ 0 < 2 ∧ 2 ≤ 2)) |
7 | 1, 2, 3, 6 | mpbir3an 1338 | . . 3 ⊢ 2 ∈ (0(,]2) |
8 | sin02gt0 15537 | . . 3 ⊢ (2 ∈ (0(,]2) → 0 < (sin‘2)) | |
9 | 7, 8 | ax-mp 5 | . 2 ⊢ 0 < (sin‘2) |
10 | cos2bnd 15533 | . . . 4 ⊢ (-(7 / 9) < (cos‘2) ∧ (cos‘2) < -(1 / 9)) | |
11 | 10 | simpri 489 | . . 3 ⊢ (cos‘2) < -(1 / 9) |
12 | 9re 11724 | . . . . 5 ⊢ 9 ∈ ℝ | |
13 | 9pos 11738 | . . . . 5 ⊢ 0 < 9 | |
14 | 12, 13 | recgt0ii 11535 | . . . 4 ⊢ 0 < (1 / 9) |
15 | 12, 13 | gt0ne0ii 11165 | . . . . . 6 ⊢ 9 ≠ 0 |
16 | 12, 15 | rereccli 11394 | . . . . 5 ⊢ (1 / 9) ∈ ℝ |
17 | lt0neg2 11136 | . . . . 5 ⊢ ((1 / 9) ∈ ℝ → (0 < (1 / 9) ↔ -(1 / 9) < 0)) | |
18 | 16, 17 | ax-mp 5 | . . . 4 ⊢ (0 < (1 / 9) ↔ -(1 / 9) < 0) |
19 | 14, 18 | mpbi 233 | . . 3 ⊢ -(1 / 9) < 0 |
20 | recoscl 15486 | . . . . 5 ⊢ (2 ∈ ℝ → (cos‘2) ∈ ℝ) | |
21 | 1, 20 | ax-mp 5 | . . . 4 ⊢ (cos‘2) ∈ ℝ |
22 | 16 | renegcli 10936 | . . . 4 ⊢ -(1 / 9) ∈ ℝ |
23 | 0re 10632 | . . . 4 ⊢ 0 ∈ ℝ | |
24 | 21, 22, 23 | lttri 10755 | . . 3 ⊢ (((cos‘2) < -(1 / 9) ∧ -(1 / 9) < 0) → (cos‘2) < 0) |
25 | 11, 19, 24 | mp2an 691 | . 2 ⊢ (cos‘2) < 0 |
26 | 9, 25 | pm3.2i 474 | 1 ⊢ (0 < (sin‘2) ∧ (cos‘2) < 0) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 209 ∧ wa 399 ∧ w3a 1084 ∈ wcel 2111 class class class wbr 5030 ‘cfv 6324 (class class class)co 7135 ℝcr 10525 0cc0 10526 1c1 10527 ℝ*cxr 10663 < clt 10664 ≤ cle 10665 -cneg 10860 / cdiv 11286 2c2 11680 7c7 11685 9c9 11687 (,]cioc 12727 sincsin 15409 cosccos 15410 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2770 ax-rep 5154 ax-sep 5167 ax-nul 5174 ax-pow 5231 ax-pr 5295 ax-un 7441 ax-inf2 9088 ax-cnex 10582 ax-resscn 10583 ax-1cn 10584 ax-icn 10585 ax-addcl 10586 ax-addrcl 10587 ax-mulcl 10588 ax-mulrcl 10589 ax-mulcom 10590 ax-addass 10591 ax-mulass 10592 ax-distr 10593 ax-i2m1 10594 ax-1ne0 10595 ax-1rid 10596 ax-rnegex 10597 ax-rrecex 10598 ax-cnre 10599 ax-pre-lttri 10600 ax-pre-lttrn 10601 ax-pre-ltadd 10602 ax-pre-mulgt0 10603 ax-pre-sup 10604 ax-addf 10605 ax-mulf 10606 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3or 1085 df-3an 1086 df-tru 1541 df-fal 1551 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2598 df-eu 2629 df-clab 2777 df-cleq 2791 df-clel 2870 df-nfc 2938 df-ne 2988 df-nel 3092 df-ral 3111 df-rex 3112 df-reu 3113 df-rmo 3114 df-rab 3115 df-v 3443 df-sbc 3721 df-csb 3829 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-pss 3900 df-nul 4244 df-if 4426 df-pw 4499 df-sn 4526 df-pr 4528 df-tp 4530 df-op 4532 df-uni 4801 df-int 4839 df-iun 4883 df-br 5031 df-opab 5093 df-mpt 5111 df-tr 5137 df-id 5425 df-eprel 5430 df-po 5438 df-so 5439 df-fr 5478 df-se 5479 df-we 5480 df-xp 5525 df-rel 5526 df-cnv 5527 df-co 5528 df-dm 5529 df-rn 5530 df-res 5531 df-ima 5532 df-pred 6116 df-ord 6162 df-on 6163 df-lim 6164 df-suc 6165 df-iota 6283 df-fun 6326 df-fn 6327 df-f 6328 df-f1 6329 df-fo 6330 df-f1o 6331 df-fv 6332 df-isom 6333 df-riota 7093 df-ov 7138 df-oprab 7139 df-mpo 7140 df-om 7561 df-1st 7671 df-2nd 7672 df-wrecs 7930 df-recs 7991 df-rdg 8029 df-1o 8085 df-oadd 8089 df-er 8272 df-pm 8392 df-en 8493 df-dom 8494 df-sdom 8495 df-fin 8496 df-sup 8890 df-inf 8891 df-oi 8958 df-card 9352 df-pnf 10666 df-mnf 10667 df-xr 10668 df-ltxr 10669 df-le 10670 df-sub 10861 df-neg 10862 df-div 11287 df-nn 11626 df-2 11688 df-3 11689 df-4 11690 df-5 11691 df-6 11692 df-7 11693 df-8 11694 df-9 11695 df-n0 11886 df-z 11970 df-uz 12232 df-rp 12378 df-ioc 12731 df-ico 12732 df-fz 12886 df-fzo 13029 df-fl 13157 df-seq 13365 df-exp 13426 df-fac 13630 df-bc 13659 df-hash 13687 df-shft 14418 df-cj 14450 df-re 14451 df-im 14452 df-sqrt 14586 df-abs 14587 df-limsup 14820 df-clim 14837 df-rlim 14838 df-sum 15035 df-ef 15413 df-sin 15415 df-cos 15416 |
This theorem is referenced by: sin4lt0 15540 pilem3 25048 |
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