Definition df-sin 13807

Description: Define the sine function. (Contributed by NM, 14-Mar-2005.)

Assertion

Ref	Expression
df-sin	|- sin = ( x e. CC |-> ( ( ( exp ` ( _i x. x ) ) - ( exp ` ( -u _i x. x ) ) ) / ( 2 x. _i ) ) )

Detailed syntax breakdown of Definition df-sin

Step	Hyp	Ref	Expression
1		csin 13801	. 2 class sin
2		vx	. . 3 setvar x
3		cc 9401	. . 3 class CC
4		ci 9405	. . . . . . 7 class _i
5	2	cv 1398	. . . . . . 7 class x
6		cmul 9408	. . . . . . 7 class x.
7	4, 5, 6	co 6196	. . . . . 6 class ( _i x. x )
8		ce 13799	. . . . . 6 class exp
9	7, 8	cfv 5496	. . . . 5 class ( exp ` ( _i x. x ) )
10	4	cneg 9719	. . . . . . 7 class -u _i
11	10, 5, 6	co 6196	. . . . . 6 class ( -u _i x. x )
12	11, 8	cfv 5496	. . . . 5 class ( exp ` ( -u _i x. x ) )
13		cmin 9718	. . . . 5 class -
14	9, 12, 13	co 6196	. . . 4 class ( ( exp ` ( _i x. x ) ) - ( exp ` ( -u _i x. x ) ) )
15		c2 10502	. . . . 5 class 2
16	15, 4, 6	co 6196	. . . 4 class ( 2 x. _i )
17		cdiv 10123	. . . 4 class /
18	14, 16, 17	co 6196	. . 3 class ( ( ( exp ` ( _i x. x ) ) - ( exp ` ( -u _i x. x ) ) ) / ( 2 x. _i ) )
19	2, 3, 18	cmpt 4425	. 2 class ( x e. CC |-> ( ( ( exp ` ( _i x. x ) ) - ( exp ` ( -u _i x. x ) ) ) / ( 2 x. _i ) ) )
20	1, 19	wceq 1399	1 wff sin = ( x e. CC |-> ( ( ( exp ` ( _i x. x ) ) - ( exp ` ( -u _i x. x ) ) ) / ( 2 x. _i ) ) )

This definition is referenced by:  sinval  13859  sinf  13861  dvsincos  22467  sincn  22924