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If x=a(theta-sintheta),y=a(1-costheta) t...

If `x=a(theta-sintheta),y=a(1-costheta)` then `(dy)/(dx)=`

A

`"cot"(theta)/(2)`

B

`"tan"(theta)/(2)`

C

`(1)/(2)"cosec"^(2)(theta)/(2)`

D

`-(1)/(2)"cosec"^(2)(theta)/(2)`

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The correct Answer is:
A
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