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A (0,a) ,B(0,b) be fixed points , P(x,0)...

A (0,a) ,B(0,b) be fixed points , P(x,0) a variable point. The angle `angle APB` is maximum if

A

`x^(2)=ab`

B

`x=ba`

C

`x^(2)=2ab`

D

`2x^(2)=ab`

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The correct Answer is:
A
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