If a line in the space makes angle `alpha,beta and gamma` with the coordinate axes, then `cos2alpha+cos2beta+cos2gamma+sin^2alpha+sin^2beta+sin^2gamma` equals

If a line in the space makes angles alpha, beta, " and " gamma with the coordinatess axes, then cos2alpha+cos2beta+cos2gamma+sin^(2)alpha+sin^(2)beta+sin^(2)gamma=

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 the co-ordinates axes, then cos 2alpha +cos 2beta +cos 2gamma is :

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 and gamma with the coordinate axes,then prove that cos2 alpha+cos2 beta+cos2 gamma=-1

If a line in the space makes angle alpha,beta and gamma with the coordinates axes, then cos^2alpha+cos^2beta+cos^2gamma is equal to a)1 b)2 c)0 d)3