`alpha/2, beta/2, gamma/2` are the angle which a line makes with positive x,y,z axes respectively. What is the value of `cosalpha+cosbeta+cosgamma?` (A) 1 (B) `-1` (C) 2 (D) 3

If alpha, beta, gamma be angles which a straighat line makes with the positive direction of the axes, then sin^2 alpha+sin^2beta+sin^2gamma is equal to (A) 4 (B) 1 (C) 2 (D) 3

If alpha+beta+gamma are the angle which a half ray makes with the positive direction of the axes then sin^2alpha+sin^2beta+sin^2gamma= (A) 1 (B) 2 (C) 0 (D) -1

If alpha, beta , gamma are the angles that a line makes with the positive direction of x, y, z axis, respectively, then the direction-cosines of the line are :

If a line makes the angles alpha,beta,gamma with the axes, then what is the value of 1+cos2alpha+cos2beta+cosgamma equal to

If a line makes the angle alpha,beta,gamma with the axes, then what is the value of 1+cos2alpha+cos2beta+cos2gamma equal to

If a line makes angles alpha, beta, gamma with the axes then cos2alpha +cos2eta+cos2gamma = (A) -2 (B) -1 (C) 1 (D) 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 the axes respectively tehn cos2alpha+cos2beta+cos2gamma= -2 b. -1 c. 1 d. 2

If alpha, beta, gamma are the angles which a line makes with the coordinate axes ,then (A) sin^2alpha=cos^2beta+cos^2gamma (B) cos^2alpha+cos^2beta+cos^2gamma=2 (C) cos^2alpha+cos^2beta+cos^2gamma=1 (D) sin^2alpha+sin^2beta=1+cos^2gamma