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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

a

B

2a

C

`-a`

D

`a//2`

Text Solution

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The correct Answer is:
B
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DIPTI PUBLICATION ( AP EAMET)-CIRCLE-Exercise 1B(Circle-Line)
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