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I need help. I have to integrate $\cos^{3} \cdot \ln(\sin(x))$ and I don´t know how to solve it. In our book it is that we have to solve using the substitution method. If somebody knows it, you will help me..please

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    substitute $u(x)=\sin(x)$2012-02-25
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    How can you use Pythagorean trigonometric identity to procede with Blah's method?2012-02-25
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    The expression is meaningless as written; is that first factor supposed to be $\cos^3 x$?2012-02-25
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    I think you mean $\cos^3x\log(\sin x)$. Is that what you want to integrate?2012-02-25
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    Oh, I sorry, I forgot argument of the function x, of course I thought cos^{3}x* ln(sin x). I've counted, thank you for your help.2012-02-25

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