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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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A
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