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If line x cos alpha + y sin alpha = p "...

If line x cos ` alpha + y sin alpha = p " touches circle " x^(2) + y^(2) =2ax ` then p =

A

`a (1 - sin alpha)`

B

`a (1 -cos alpha)`

C

`a (1 + sin alpha)`

D

`a (1 + cos alpha)`

Text Solution

Verified by Experts

The correct Answer is:
D
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