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Question

The value of
cosθsin(900+θ)+sinθsin(1800+θ)+cot(900θ)tanθ is

A
1
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B
2
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C
3
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D
4
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Solution

The correct option is A 1
cosθsin(900+θ)+sinθsin(1800+θ)+cot(900θ)tanθ
=cosθcosθ+sinθsinθ+tanθtanθ=11+1=1

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