trig and sin, which is equivalent.?

0 ⤊

Which of the following is equivalent to sin (90* + x)

sin(x)
cos(x)
sin(-x)
cos(-x)
-cos(x)

2007-11-25 16:17:06 · 4 answers · asked by dustin_r_85 1 in Science & Mathematics ➔ Mathematics

sin(a+b)=sin(a)cos(b)+cos(a)sin(b) (trig identity)
sin(90+b)=sin(90)cos(b)+cos(90)sin(b)
sin(90+b)=sin(90)cos(b)+cos(90)sin(b)
sin(90+b)=cos(b)

2007-11-25 16:45:37 · answer #1 · answered by roarfy 2 · 0⤊ 0⤋

sin(90*+ x) = cosx

2007-11-25 16:26:00 · answer #2 · answered by sv 7 · 0⤊ 0⤋

cos(x) and cos(-x) since cos(x) = cos(-x)

2007-11-25 16:27:56 · answer #3 · answered by Helmut 7 · 0⤊ 0⤋

why don't you say equal instead of equivalent?

2007-11-25 16:44:59 · answer #4 · answered by Theta40 7 · 0⤊ 0⤋