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Two perpendicular tangents to the circle...

Two perpendicular tangents to the circle `x^2 + y^2= a^2` meet at P. Then the locus of P has the equation

A

`x^(2)+y^(2)-2a^(2)`

B

`x^(2)+y^(2)=3a^(2)`

C

`x^(2)+y^(2)=4a^(2)`

D

none of these

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The correct Answer is:
A
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