Theorem coshval-named 42478

Description: Value of the named cosh function. Here we show the simple conversion to the conventional form used in set.mm, using the definition given by df-cosh 42475. See coshval 14885 for a theorem to convert this further. (Contributed by David A. Wheeler, 10-May-2015.)

Assertion

Ref	Expression
coshval-named	|- ( A e. CC -> (cosh ` A ) = ( cos ` ( _i x. A ) ) )

Proof of Theorem coshval-named

Dummy variable x is distinct from all other variables.

Step	Hyp	Ref	Expression
1		oveq2 6658	. . 3 |- ( x = A -> ( _i x. x ) = ( _i x. A ) )
2	1	fveq2d 6195	. 2 |- ( x = A -> ( cos ` ( _i x. x ) ) = ( cos ` ( _i x. A ) ) )
3		df-cosh 42475	. 2 |- cosh = ( x e. CC |-> ( cos ` ( _i x. x ) ) )
4		fvex 6201	. 2 |- ( cos ` ( _i x. A ) ) e. _V
5	2, 3, 4	fvmpt 6282	1 |- ( A e. CC -> (cosh ` A ) = ( cos ` ( _i x. A ) ) )

Syntax hints:   -> wi 4   = wceq 1483   e. wcel 1990   ` cfv 5888  (class class class)co 6650   CCcc 9934   _ici 9938   x. cmul 9941   cosccos 14795  coshccosh 42472

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pr 4906

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ral 2917  df-rex 2918  df-rab 2921  df-v 3202  df-sbc 3436  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-sn 4178  df-pr 4180  df-op 4184  df-uni 4437  df-br 4654  df-opab 4713  df-mpt 4730  df-id 5024  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-iota 5851  df-fun 5890  df-fv 5896  df-ov 6653  df-cosh 42475

This theorem is referenced by:  sinhpcosh  42481