Question

Evaluate cos(sin^-1a)

Answer 1

(√1 - a²)

Explanation:

cos(sin⁻¹ a) = cos x°

sin x° = sin (sin⁻¹ a) = a

as shown in the attached picture

sin x° = a/1 cos x° = (√1 - a²) / 1 = (√1 - a²)