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Question

If the angles made by a straight line with the coordinate axes are α,π2α,β then β=

A
0
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B
π6
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C
π2
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D
π
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Solution

The correct option is A π2
Given angles are α,900α,β

The summations of cosines of these angles has to be 1.

So, cos2α+cos2(900α)+cos2β=1
cos2α+sin2α+cos2β=1

cos2β=0

β=π2

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