Question 865061
Solve the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to three decimal places where appropriate. If there is no solution, enter NO SOLUTION.)
For interval (0,2π)
cos (2θ) = cos^2 θ − (1/2)
cos^2 θ -sin^2 θ =cos^2 θ -1/2
sin^2 θ =1/2
sin θ =±1/√2=±√2/2
θ =π/4, 3π/4, 5π/4, 7π/4