If `alpha, beta, gamma` are direction angles of a line l, then prove that `cos^(2)alpha+cos
Channel: Doubtnut
Date: 29/03/2020

If `alpha, beta, gamma` are direction angles of a line l, then prove that `cos^(2)alpha+cos^(2)beta+cos^(2)gamma=1`. Hence, deduce that `sin^(2) alpha + sin^(2) beta + sin^(2) gamma = 2`.