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Posted by DK on Friday, May 25, 2012 at 9:24am.

Derivative of y=in((e^-2x)(cos4x))

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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