pcosphi 2p2sin2phicos2theta pcosphi p2 sin2phi where does th

pcos(phi)= 2(p^2)(sin^2(phi))(cos^2(theta)

pcos(phi)= (p^2) sin^2(phi)

.....where does the cos^2(theta) go?

pcos(phi)= 2(p^2)(sin^2(phi))(cos^2(theta) cos^2(theta) = 1- sin^2(theta) pcos(phi)= 2(p^2)(sin^2(phi))(1- sin^2(theta)) pcos(phi)= 2(p^2)(sin^2(phi)) - 2(p^2)(sin^2(phi))(sin^2(theta)) pcos(phi)= (p^2) sin^2(phi)