A and B are complementary angles of right triangle ABC, COS A = 0.83, and cos B = 0.55. What is sin A + sin B?

Complementary angles are two angles which add up to 90° or forms a right angle. First, we find the value of A and B.

A = arccosine (0.83) = 34°

B = 90 - 34 = 56°

Thus, sin A = 0.56 and sin B = 0.83.