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The condition that the line (x + g) cos ...

The condition that the line (x + g) cos `theta` + ( y +f ) sin `theta` = k is a tangent to `x^2+y^2 +2gx +2fy +c=0` :

A

`g^(2)+f^(2)=c^(2)+k`

B

`g^(2)+f^(2)=c+k`

C

`g^(2)+f^(2)=c+k^(2)`

D

`g^(2)+f^(2)=c^(2)+k^(2)`

Text Solution

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The correct Answer is:
C
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