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what is the derivative of ln(x^(4x))?

 Dec 12, 2016
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Possible derivation:
d/dx(log(x^(4 x)))
Simplify log(x^(4 x)) using the identity log(a^b) = b log(a):
 = d/dx((4 x) log(x))
Factor out constants:
 = 4 (d/dx(x log(x)))
Use the product rule, d/dx(u v) = v ( du)/( dx) + u ( dv)/( dx), where u = x and v = log(x):
 = 4 log(x) (d/dx(x)) + x (d/dx(log(x)))
The derivative of x is 1:
 = 4 (x (d/dx(log(x))) + 1 log(x))
The derivative of log(x) is 1/x:
 = 4 (log(x) + 1/x x)
Simplify the expression:
Answer: |= 4 (1 + log(x))

 Dec 12, 2016

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