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January 26, 2015

January 26, 2015

Posted by **John** on Tuesday, October 11, 2011 at 8:42pm.

Use logarithmic differentiation to find the derivative of the function.

- calculus -
**Reiny**, Tuesday, October 11, 2011 at 10:21pmlny = ln[(lnx)^(cos(4x))]

= cos(4x) * ln(ln(x))

y'/y = cos(4x)*1/ln(x) * 1/x + ln(ln(x))(-4sin(4x)

y' = (ln x)^(cos4x) [cos(4x)*1/ln(x) * 1/x + ln(ln(x))(-4sin(4x) ]

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