If the derivative of \(\dfrac{e^{3x} + e^x}{e^{4x} - e^{2x} + 1}\) if f(ex - e-x) + C, then f(x) is equal to:

If the derivative of \(\dfrac{e^{3x} + e^x}{e^{4x} - e^{2x} + 1}\) i

1.	If the derivative of \(\dfrac{e^{3x} + e^x}{e^{4x} - e^{2x} + 1}\) if f(ex - e-x) + C, then f(x) is equal to:
A.	tan-1 x
B.	tan x
C.	cos-1 x
D.	sin x
Answer» B. tan x

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If the derivative of \(\dfrac{e^{3x} + e^x}{e^{4x} - e^{2x} + 1}\) if f(ex - e-x) + C, then f(x) is equal to:

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