1.

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

Answer»

`x = y = N pi pm (pi)/(6), n in Z`
`x = y = npi pm (pi)/(4), n in Z`
`x = y = n pi pm (pi)/(3), n in Z`
`x = y= n pipm (pi)/(2), n in Z`

Answer :B


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