If a line makes angles `alpha, beta, gamma` with the coordinate axes, prove that `cos2alpha + cos 2beta + cos2gamma + 1 = 0`.

If a line makes angles alpha,beta and gamma with the coordinate axes,then prove that cos2 alpha+cos2 beta+cos2 gamma=-1

If a line makes angles alpha ,beta , gamma with the co-ordinates axes, then cos 2alpha +cos 2beta +cos 2gamma is :

If a line makes angles alpha, beta, gamma with the coordinate axes, prove that sin^2alpha+sin^2beta+sin^2gamma=2

If a line makes angle alpha, beta and gamma with the coordinate axes respectively, then cos2alpha+cos 2 beta+cos 2gamma=

If a line makes angles alpha,beta,gamma with co-ordinate axes, then cos2alpha+cos 2 beta+cos2gamma=

If a line makes angles alpha,beta,gamma with co-ordinate axes, then cos2alpha+cos 2 beta+cos2gamma= a) -2 b) -1 c) 1 d) 2

A line makes angles alpha, beta, gamma, delta with the diagonals of a cube, prove that cos^2alpha + cos^2beta + cos^2gamma + cos^2 delta = 4/3

If a line makes angles (alpha)/(2), (beta)/(2), (gamma)/(2) with co-ordinate axes, then cos alpha+cos beta+cos gamma=

If a line makes angles (alpha)/(2), (beta)/(2), (gamma)/(2) with co-ordinate axes, then cos alpha+cos beta+cos gamma=