A radar system relies on the equation: cos² θ − sin² θ = cos 2θ
What is the value of cos² θ − sin²(90° − θ)?
Show answer & explanation
Correct answer: B
Explanation
Has been given :
cos²θ − sin²θ = cos 2θ
According to the formula:
sin(90° − θ) = cosθ
cos²θ − sin²(90° − θ)
= cos²θ − cos²θ
= 0