Question

I'm doing an integrating by parts problem. u=cos(ln8x). What would du be?

Answer 1

chain rule

Answer 2

\[\frac{ -\sin(\ln8x) }{ x }\]?

Answer 3

\[-\sin\left(\ln 8x\right)\cdot \frac{1}{x} \]
that's what i got

Answer 4

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