Question

Find the value of cos (90-θ) + cos θ × sin(90-θ)​

Answer 1

Answer:

Two angles are said to be complementary of their sum is equal to 90°

Step-by-step explanation:

θ & (90° - θ) are complementary angles. Hence, the value of cos θ cos (90 –θ ) – sin θ sin (90 – θ) is 0 (zero).