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If x=a (cos t +log (tan ((t)/(2)) )) ,y...

If ` x=a (cos t +log (tan ((t)/(2)) )) ,y =a sin t ,then (dy)/(dx) =`

A

` tant `

B

` -tan t `

C

` cot t`

D

` -cott`

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The correct Answer is:
A
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