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Question

If x=sin(90a)cot(90a), then x is equal to .................


A
cot a
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B
cos a
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C
tan a
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D
sin a
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Solution

The correct option is D sin a

cot(90a)=cos(90a)sin(90a)

Hence, sin(90a)cot(90a)=sin(90a)×cos(90a)sin(90a)

=cos(90a)

=sin a


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