The given expression sec^2 theta =(4xy)/...

The given expression `sec^2 theta =(4xy)/((x+y)^(2))` is true if and only if :

A

`x+ y ne 0`

B

`x=y, x ne 0`

C

`x=y`

D

`x ne 0 , y ne 0`

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The correct Answer is:

B

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