How do you find the general solution for cos2A=cos^2A

A = 0 + / - nπ radians, where n is an integer.

Step-by-step explanation:

cos 2A = cos^2 A

Use the identity cos 2A = 2 cos^2 A - 1:

2cos^2 A - 1 = cos^2 A

cos^2 A = 1

Cos A = + / -1

When cos A = 1, A = 0 + / - 2nπ radians.

when cos A = - 1, A = π + / - nπ radians.