If tan^(4)x+tan^(4)y+2cot^(2)xcot^(2)y=3...

If `tan^(4)x+tan^(4)y+2cot^(2)xcot^(2)y=3+sin^(2)(x+y)` then

A

`x = y = n pi pm (pi)/(6), n in Z`

B

`x = y = npi pm (pi)/(4), n in Z`

C

`x = y = n pi pm (pi)/(3), n in Z`

D

`x = y = n pipm (pi)/(2), n in Z`

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The correct Answer is:

B

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