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If the angles made by a line with the positive directions of X and Y-axes are complementary angles then the angle made by the line with Z- axis is 

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a
0
b
π3
c
π4
d
π2

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detailed solution

Correct option is D

α=θ ⇒β=900−θcos2α+cos2β+cos2γ=1 ⇒γ=900

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