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July 7, 2015

July 7, 2015

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

- calculus -
**Steve**, Friday, May 25, 2012 at 10:59amy = ln((e^(-2x))(cos4x))

= ln(e^-2x) + ln(cos 4x)

= -2x + ln(cos 4x)

y' = -2 - 4sin4x/cos4x

= -2 - 4tan4x