Question

prove the identity
sin( pi/2 + theta) = cos theta

Answer 1

Answer:

You need to use the sin(a+b) trigonometric identity.

Step-by-step explanation:

sin(pi/2 + theta) = sin(pi/2)cos(theta) + cos(pi/2)sin(theta)

= 1*cos(theta) +0*sin(theta)

= cos(theta)