Question

sin[1/2 cos inverse 4/5​

Answer 1

Answer:

Step-by-step explanation:

Let cos^-1 (4/5) = A. So, cos A = 4/5

1 - 2 sin^2 A/2 =4/5 or 1 - 4/5 = 2 sin^2 A/2

So sin A/2 = +/- 1/√10.