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Question

The numerical value of (1−cosx)(1+cosx)(1+cot2x) is

A
0
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B
1
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C
2
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D
3
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Solution

The correct option is B 1
(1cosx)(1+cosx)(1+cot2x)=(1cos2x)(cosec2x)=sin2x(cosec2x)=1

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