Question

cos theta ×cos (90- theta) - sin theta × sin (90-theta)

Answer 1

given
cos theta×cos(90-thetha)-sin theta×sin(90-theta)
now
cos theta×sin theta-sin theta×cos theta
cancel them and ans will be 0

Answer 2

Hello user

Your answer is given below :

⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐


$given \: \\ \\ = > \cos(x) \times \cos(90 - x) - \sin(x) \times \sin(90 - x \\ \\ = > \cos(x ) \times \sin(x) - \sin(x) \times \cos(x) \\ \\ = > 0 \: \: < = = = answer$

⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐

Important points

♠️ cos (90°-x) = sin ( x )

♠️sin ( 90° -x ) = cos ( x)

⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐