math
posted by Amirul Thaqif on .
cos^2 theta  sin^2 theta = 1

only if theta = 0 or pi
since cos^2 θ  sin^2 θ = cos2θ
posted by Amirul Thaqif on .
cos^2 theta  sin^2 theta = 1
only if theta = 0 or pi
since cos^2 θ  sin^2 θ = cos2θ