Question

The value of sin theta.sin(90-theta) -cos (90-theta) ?

Answer 1

sin theta.cos theta - sin theta
sin theta (cos theta-1)
2sin theta/2.cos theta/2 (-2sin^2theta/2)
= - 4 sin^3 theta/2.cos theta
instead of theta write as sinx or cosx so that no
need to write theta again and again