Question

sin² 17.5° + sin² 72.5° is equal to ______.

विकल्प

• cos² 90°

• tan² 45°

• cos² 30°

• sin² 45°

Answer 1

sin² 17.5° + sin² 72.5° is equal to tan² 45°.

Explanation:

sin² 17.5° + sin² 72.5°

= sin² 17.5° + cos² 17.5° ...[∵ sin (90° – θ) = cos θ]

= 1   

= tan² 45°