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Questions  

What.is the angle between P and the cross product of (P + Q) and (P - Q)?  

a
900
b
tan-1 (P/Q)
c
tan-1 (Q/P)
d
00

detailed solution

Correct option is A

Cross product of (P + Q) and (P - Q) is perpendicular to the plane formed by (P + Q) and (P - Q) or P          (or Q).

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