calculus
posted by DK .
Derivative of y=in((e^2x)(cos4x))

calculus 
Steve
y = ln((e^(2x))(cos4x))
= ln(e^2x) + ln(cos 4x)
= 2x + ln(cos 4x)
y' = 2  4sin4x/cos4x
= 2  4tan4x
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