if the angles made by a straight line with the coordinate axes are `alpha, pi/2-alpha, beta " then " beta=`

If alpha, beta, gamma are the angle made by a vector with the coordinate axes, then sin^(2) alpha + sin^(2) beta + sin^(2) gamma =

Assertion (A) : If a line make angles 45^(@), 45^(@) with the x and y axis repectively then it makes angle 60^(@) with z - axis Reason (R ) : If alpha,beta,lambda are the angle made by a line with the coordinate axes then cos^(2) alpha + cos^(2)beta + cos^(2) lambda = 1

A line makes angles alpha,beta,gamma with the coordinate axes. If alpha + beta = pi//2 , then (cos alpha+cosbeta+cosgamma)^(2) is equal to

If alpha, beta, gamma are the angles made by a line with the positive directions of the coordinate axes, then sin^(2)alpha+sin^(2)beta+sin^(2)gamma=

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