If x=a cos theta, y=a sin theta, then (d...

If `x=a cos theta, y=a sin theta`, then `(dy)/(dx)` at `theta=(pi)/(2)` will be:

A

`(dy)/(dx) = -1`

B

`(dy)/(dx)= 1`

C

`(dy)/(dx)=0`

D

`(dy)/(dx)=2`

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