`alpha` and `beta` are the angle made by a vector from positive x & positive y-axes redpectively. Which set of `alpha` and `beta` is not possible

Let alpha,beta,gamma be the angle made by a line with the positive direction of the X,Y,Z axes respectively.(i) Write the direction cosines of the line.

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 =

If alpha, beta and gamma are the angles made by a vector with X, Y and Z- axes then sin^(2) alpha + sin^(2) beta + sin^(2) gamma is

Let alpha, beta, gamma be the angles made by a line with the positive directions of the axes of reference in three dimensions. If theta is the acute angle given by costheta=(cos^(2)alpha+cos^(2)beta+cos^(2)gamma)/(sin^(2)alpha+sin^(2)beta+sin^(2)gamma) , then theta equal.

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

If alpha, beta and gamma are angles made by the line with positive direction of X-axis, Y-axis and Z-axis respectively, then find the value of cos2alpha+cos2beta+cos2gamma .

If alpha, beta and gamma are angles made by the line with positive direction of X-axis, Y-axis and Z-axis respectively, then find the value of cos2alpha+cos2beta+cos2gamma .