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If x=costheta,y=log ( tan ((theta)/(2))...

If ` x=costheta,y=log ( tan ((theta)/(2))),then (dy)/(dx) =`

A

` sin ^(2)theta`

B

` -sin ^(2)theta `

C

` cosec ^(2)theta`

D

` -cosec ^(2)theta`

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The correct Answer is:
D
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  10. If x=(t+1/t)^a ,y=a^(t+1/t),"f i n d"(dy)/(dx)

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