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Question

A line makes angles α,β,γ with the co-ordinate axes. If α+β=90, then γ =

A
0
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B
90
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C
180
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D
None of these
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Solution

The correct option is B 90
Here, cos2α+cos2(90α)+cos2γ=1
cos2α+sin2α+cos2γ=1
cos2γ+1=1γ=90

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