Question

Verify the identity. cos (x+pi/2) = -sin x

Answer 1

try using the identity

cos(a = b) = cos a cos b - sin a sin b

Answer 2

* cos (a + b)

Answer 3

you also need to know the values of cos pi/2 and sin pi/2
(pi/2 = 90 degrees)

Answer 4

how exactly would I put that into the equation? I mean how would I set that up? @cwrw238

Answer 5

put a = x and b = pi/2

and start it for you

cos (x + pi/2) = cos x cos pi/2 - sin__ cos __

fill in the blanks