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The straight line xcos theta+y sin thet...

The straight line `xcos theta+y sin theta=2` will touch the circle `x^2 + y^2-2x = 0` , if

A

`theta=n pi,n in I`

B

`A=(2n+1)pi,n in I`

C

`theta=2npi,n in I`

D

none of these

Text Solution

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The correct Answer is:
3
The center of the circle is (1,0) and radius is 1. The line will touch the circle if `|cos theta -2 | =1`.
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