Question

Find the value of: cos theta cos theta (90°- theta) - sin theta sin (90°-theta)​

Answer 1

QUESTION :

Find the value of: cos theta cos theta (90°- theta) - sin theta sin (90°-theta)

Step-by-step explanation:

Using identities cos(90-x) = sinx and sin(90-x) = cosx

cosx.cos(90-x) - sinx.sin(90-x)

= cosxsinx - sinxcosx

= 0