Question

Solve COS
There are two solutions, A and B, with A < B.

Answer 1

A = 0.850

B = 5.433

Explanation:

cos⁻¹(0.66) = 0.850

A = 0.850

2π - 0.850 = 5.433

B = 5.433

Cosine function is + in the 1st and 4th quadrants.

To find the second solution (B), subtract the reference angle 0.850 from 2π