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Question

If cotθ = 78, then the value of (1+cosθ)(1sinθ).(1cosθ)(1+sinθ) is:

A
4964
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B
87
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C
6449
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D
78
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Solution

The correct option is B 6449
(1+cosθ)(1cosθ)(1sinθ)(1+sinθ)=1cos2θ1sin2θ=sin2θcos2θ=tan2θ=1cot2θ=(87)2=6449

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