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Homework Statement
Simplify ##d(log(x^2 + y^2) − z^3)##
Homework Equations
the derivative?
The Attempt at a Solution
The instruction says to simplify. In a similar problem I ended up using the d(a(b-c))= da d(b-c). I am not sure how to deal with the log and only found formulas for ln. Could I just substitute the whole log term with another variable?