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The line x cos alpha+y sin alpha=p touch...

The line `x cos alpha+y sin alpha=p` touches the circle `x^(2)+y^(2)-2ax cos alpha-2ay sin alpha=0. then p=`

A

All values of k

B

2a

C

`-a`

D

`a//2`

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The correct Answer is:
B
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AAKASH SERIES-CIRCLES-PRACTICE EXERCISE
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  16. Tangents from point P are drawn one of each of th circle x^(2)+y^(2)-4...

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