Asked by gnozahs

Find the derivative of f(x)=[lnx]^4

Answers

Answered by Damon
let 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
Answered by gnozahs
Thank you! I've been stuck on that problem all night.
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