Question

The value of (cos² 23° – sin² 67°) is ______.

Answer 1

The value of (cos² 23° – sin² 67°) is 0.

Explanation:

sin 67° = sin (90° – 23°)

= cos 23°

So cos² 23° – sin² 67° = cos² 23° – cos² 23°

= 0