1.

If int (4 sec^(2)" x tan x")/(sec^(2) " x + tan"^(2) x)" dx = log " |1 + f(x) | + Cthenf(x) =

Answer»

2 `sin^(2) ` x
`2 cos^(2) `x
`2 TAN^(2) ` x
`2 COT^(2)` x

ANSWER :C


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