Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > ILE Home > Th. List > tan4thpi | GIF version |
Description: The tangent of π / 4. (Contributed by Mario Carneiro, 5-Apr-2015.) |
Ref | Expression |
---|---|
tan4thpi | ⊢ (tan‘(π / 4)) = 1 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pire 12915 | . . . . 5 ⊢ π ∈ ℝ | |
2 | 4nn 8907 | . . . . 5 ⊢ 4 ∈ ℕ | |
3 | nndivre 8780 | . . . . 5 ⊢ ((π ∈ ℝ ∧ 4 ∈ ℕ) → (π / 4) ∈ ℝ) | |
4 | 1, 2, 3 | mp2an 423 | . . . 4 ⊢ (π / 4) ∈ ℝ |
5 | 4 | recni 7802 | . . 3 ⊢ (π / 4) ∈ ℂ |
6 | sincos4thpi 12969 | . . . . 5 ⊢ ((sin‘(π / 4)) = (1 / (√‘2)) ∧ (cos‘(π / 4)) = (1 / (√‘2))) | |
7 | 6 | simpri 112 | . . . 4 ⊢ (cos‘(π / 4)) = (1 / (√‘2)) |
8 | sqrt2re 11877 | . . . . . 6 ⊢ (√‘2) ∈ ℝ | |
9 | 8 | recni 7802 | . . . . 5 ⊢ (√‘2) ∈ ℂ |
10 | 2re 8814 | . . . . . . 7 ⊢ 2 ∈ ℝ | |
11 | 2pos 8835 | . . . . . . 7 ⊢ 0 < 2 | |
12 | 10, 11 | sqrtgt0ii 10935 | . . . . . 6 ⊢ 0 < (√‘2) |
13 | 8, 12 | gt0ap0ii 8414 | . . . . 5 ⊢ (√‘2) # 0 |
14 | recap0 8469 | . . . . 5 ⊢ (((√‘2) ∈ ℂ ∧ (√‘2) # 0) → (1 / (√‘2)) # 0) | |
15 | 9, 13, 14 | mp2an 423 | . . . 4 ⊢ (1 / (√‘2)) # 0 |
16 | 7, 15 | eqbrtri 3957 | . . 3 ⊢ (cos‘(π / 4)) # 0 |
17 | tanvalap 11451 | . . 3 ⊢ (((π / 4) ∈ ℂ ∧ (cos‘(π / 4)) # 0) → (tan‘(π / 4)) = ((sin‘(π / 4)) / (cos‘(π / 4)))) | |
18 | 5, 16, 17 | mp2an 423 | . 2 ⊢ (tan‘(π / 4)) = ((sin‘(π / 4)) / (cos‘(π / 4))) |
19 | 6 | simpli 110 | . . 3 ⊢ (sin‘(π / 4)) = (1 / (√‘2)) |
20 | 19, 7 | oveq12i 5794 | . 2 ⊢ ((sin‘(π / 4)) / (cos‘(π / 4))) = ((1 / (√‘2)) / (1 / (√‘2))) |
21 | 9, 13 | recclapi 8526 | . . 3 ⊢ (1 / (√‘2)) ∈ ℂ |
22 | 21, 15 | dividapi 8529 | . 2 ⊢ ((1 / (√‘2)) / (1 / (√‘2))) = 1 |
23 | 18, 20, 22 | 3eqtri 2165 | 1 ⊢ (tan‘(π / 4)) = 1 |
Colors of variables: wff set class |
Syntax hints: = wceq 1332 ∈ wcel 1481 class class class wbr 3937 ‘cfv 5131 (class class class)co 5782 ℂcc 7642 ℝcr 7643 0cc0 7644 1c1 7645 # cap 8367 / cdiv 8456 ℕcn 8744 2c2 8795 4c4 8797 √csqrt 10800 sincsin 11387 cosccos 11388 tanctan 11389 πcpi 11390 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 ax-5 1424 ax-7 1425 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1483 ax-10 1484 ax-11 1485 ax-i12 1486 ax-bndl 1487 ax-4 1488 ax-13 1492 ax-14 1493 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 ax-coll 4051 ax-sep 4054 ax-nul 4062 ax-pow 4106 ax-pr 4139 ax-un 4363 ax-setind 4460 ax-iinf 4510 ax-cnex 7735 ax-resscn 7736 ax-1cn 7737 ax-1re 7738 ax-icn 7739 ax-addcl 7740 ax-addrcl 7741 ax-mulcl 7742 ax-mulrcl 7743 ax-addcom 7744 ax-mulcom 7745 ax-addass 7746 ax-mulass 7747 ax-distr 7748 ax-i2m1 7749 ax-0lt1 7750 ax-1rid 7751 ax-0id 7752 ax-rnegex 7753 ax-precex 7754 ax-cnre 7755 ax-pre-ltirr 7756 ax-pre-ltwlin 7757 ax-pre-lttrn 7758 ax-pre-apti 7759 ax-pre-ltadd 7760 ax-pre-mulgt0 7761 ax-pre-mulext 7762 ax-arch 7763 ax-caucvg 7764 ax-pre-suploc 7765 ax-addf 7766 ax-mulf 7767 |
This theorem depends on definitions: df-bi 116 df-stab 817 df-dc 821 df-3or 964 df-3an 965 df-tru 1335 df-fal 1338 df-nf 1438 df-sb 1737 df-eu 2003 df-mo 2004 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-ne 2310 df-nel 2405 df-ral 2422 df-rex 2423 df-reu 2424 df-rmo 2425 df-rab 2426 df-v 2691 df-sbc 2914 df-csb 3008 df-dif 3078 df-un 3080 df-in 3082 df-ss 3089 df-nul 3369 df-if 3480 df-pw 3517 df-sn 3538 df-pr 3539 df-op 3541 df-uni 3745 df-int 3780 df-iun 3823 df-disj 3915 df-br 3938 df-opab 3998 df-mpt 3999 df-tr 4035 df-id 4223 df-po 4226 df-iso 4227 df-iord 4296 df-on 4298 df-ilim 4299 df-suc 4301 df-iom 4513 df-xp 4553 df-rel 4554 df-cnv 4555 df-co 4556 df-dm 4557 df-rn 4558 df-res 4559 df-ima 4560 df-iota 5096 df-fun 5133 df-fn 5134 df-f 5135 df-f1 5136 df-fo 5137 df-f1o 5138 df-fv 5139 df-isom 5140 df-riota 5738 df-ov 5785 df-oprab 5786 df-mpo 5787 df-of 5990 df-1st 6046 df-2nd 6047 df-recs 6210 df-irdg 6275 df-frec 6296 df-1o 6321 df-oadd 6325 df-er 6437 df-map 6552 df-pm 6553 df-en 6643 df-dom 6644 df-fin 6645 df-sup 6879 df-inf 6880 df-pnf 7826 df-mnf 7827 df-xr 7828 df-ltxr 7829 df-le 7830 df-sub 7959 df-neg 7960 df-reap 8361 df-ap 8368 df-div 8457 df-inn 8745 df-2 8803 df-3 8804 df-4 8805 df-5 8806 df-6 8807 df-7 8808 df-8 8809 df-9 8810 df-n0 9002 df-z 9079 df-uz 9351 df-q 9439 df-rp 9471 df-xneg 9589 df-xadd 9590 df-ioo 9705 df-ioc 9706 df-ico 9707 df-icc 9708 df-fz 9822 df-fzo 9951 df-seqfrec 10250 df-exp 10324 df-fac 10504 df-bc 10526 df-ihash 10554 df-shft 10619 df-cj 10646 df-re 10647 df-im 10648 df-rsqrt 10802 df-abs 10803 df-clim 11080 df-sumdc 11155 df-ef 11391 df-sin 11393 df-cos 11394 df-tan 11395 df-pi 11396 df-rest 12161 df-topgen 12180 df-psmet 12195 df-xmet 12196 df-met 12197 df-bl 12198 df-mopn 12199 df-top 12204 df-topon 12217 df-bases 12249 df-ntr 12304 df-cn 12396 df-cnp 12397 df-tx 12461 df-cncf 12766 df-limced 12833 df-dvap 12834 |
This theorem is referenced by: (None) |
Copyright terms: Public domain | W3C validator |