The normal at theta of the circle x^(2)+...

The normal at `theta` of the circle `x^(2)+y^(2)=a^(2)` is

A

`x cos theta+y sin theta=0`

B

`x cos theta -y sin theta=0`

C

`x sin theta +y cos theta=0`

D

`x sin theta -y cos theta=0`

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The correct Answer is:

D

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