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August 21, 2014

August 21, 2014

Posted by **gnozahs** on Thursday, June 11, 2009 at 4:03am.

- calculus -
**Damon**, Thursday, June 11, 2009 at 5:15amlet z = ln x

dz = dx/x

dx = x dz

then

f(z) = z^4

df = 4 z^3 dz = 4 z^3 dx/x

df/dx = (4 /x) (ln x)^3

- calculus -
**gnozahs**, Thursday, June 11, 2009 at 12:01pmThank you! I've been stuck on that problem all night.

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