1.

If (dx)/(sin^(4)x+cos^(4)x)=(1)/(sqrt(2))tan^(-1)f(x)+C

Answer»

F(X) = tan x - cot x
`f(pi//4) = 0`
f(x) is continous on R
`f(x) = (1)/(2) (tan x - cot x)`

ANSWER :B


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