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# calculus help please! The substituion rule.?

Evaluate the indefinite integral. (Remember to use ln(abs(u)) where appropriate.

Integral of : (sin(ln(25x)) / x dx

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- 1 decade agoFavorite Answer
Let u = ln(25x). Then du = 25/(25x) dx = dx/x.

So you can now integrate sin(u)du.

This is -cos(u) + C = - cos(ln(25x)) + C

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