Question

In a ΔAВС, ∠C = 90°. Then, the value of cos (A + B) is ______.

विकल्प

• 0

• 1

• `1/2`

• `3/5`

Answer 1

In a ΔAВС, ∠C = 90°. Then, the value of cos (A + B) is 0.

Explanation:

Clearly, A + B = 90°.

So, cos (A + B) = cos 90° = 0.