The answer is D) 30 o ,45 o We know that for a vector, cos 2 a + cos 2 b + cos 2 c = 1 , (where a,b,c are the angles made by the vector from positive x,y,z axis resp.) or cos 2 a + cos 2 b = sin 2 c Now, 0 2 c 2 a + cos 2 b This condition is followed by every given set except the D) one. Hence, that is your answer.

ALTSM 22/03 Q91

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ALTSM 22/03 Q91

ALTSM 22/03 Q91

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