1.

If A + B + C = 90°, the what is the value of cos (A + C) ? (A) – cos B (B) cos B (C) – sin B (D) sin B

Answer»

The correct option is (D) sin B

Explanation:

Given A + B + C = 90° 

cos (A + C) cos (90 – B) {∵ cos (90 – θ) = sinθ

 sinB



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