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Theorem acosval 26849
Description: Value of the arccos function. (Contributed by Mario Carneiro, 31-Mar-2015.)
Assertion
Ref Expression
acosval (𝐴 ∈ ℂ → (arccos‘𝐴) = ((π / 2) − (arcsin‘𝐴)))

Proof of Theorem acosval
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 fveq2 6834 . . 3 (𝑥 = 𝐴 → (arcsin‘𝑥) = (arcsin‘𝐴))
21oveq2d 7374 . 2 (𝑥 = 𝐴 → ((π / 2) − (arcsin‘𝑥)) = ((π / 2) − (arcsin‘𝐴)))
3 df-acos 26832 . 2 arccos = (𝑥 ∈ ℂ ↦ ((π / 2) − (arcsin‘𝑥)))
4 ovex 7391 . 2 ((π / 2) − (arcsin‘𝐴)) ∈ V
52, 3, 4fvmpt 6941 1 (𝐴 ∈ ℂ → (arccos‘𝐴) = ((π / 2) − (arcsin‘𝐴)))
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1541  wcel 2113  cfv 6492  (class class class)co 7358  cc 11024  cmin 11364   / cdiv 11794  2c2 12200  πcpi 15989  arcsincasin 26828  arccoscacos 26829
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 1968  ax-7 2009  ax-8 2115  ax-9 2123  ax-10 2146  ax-11 2162  ax-12 2184  ax-ext 2708  ax-sep 5241  ax-nul 5251  ax-pr 5377
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1544  df-fal 1554  df-ex 1781  df-nf 1785  df-sb 2068  df-mo 2539  df-eu 2569  df-clab 2715  df-cleq 2728  df-clel 2811  df-nfc 2885  df-ne 2933  df-ral 3052  df-rex 3061  df-rab 3400  df-v 3442  df-dif 3904  df-un 3906  df-ss 3918  df-nul 4286  df-if 4480  df-sn 4581  df-pr 4583  df-op 4587  df-uni 4864  df-br 5099  df-opab 5161  df-mpt 5180  df-id 5519  df-xp 5630  df-rel 5631  df-cnv 5632  df-co 5633  df-dm 5634  df-iota 6448  df-fun 6494  df-fv 6500  df-ov 7361  df-acos 26832
This theorem is referenced by:  acosneg  26853  cosacos  26856  acoscos  26859  acos1  26861  acosbnd  26866  acosrecl  26869  sinacos  26871
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