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ekaknr
 one year ago
Best ResponseYou've already chosen the best response.0well, you will need to take cos x as a variable, say 't', and then use chain rule to say that dx = dt/sinx Then, you substitute for cos x and simplify and then integrate, and finally substitute for 't' to get the answer.

yegiel
 one year ago
Best ResponseYou've already chosen the best response.0thanks a lot for your reply, but can you explain a little bit more de chain rule part?

rbliss11
 one year ago
Best ResponseYou've already chosen the best response.0You first need to change sin^3x as follows: sin^3x =sin^2x sinx =(1cos^2x)sinx Substitute this form into original integral and distribute cos^(1/2) over (1cos^2x) so you now have integral of (cos^(1/2)xsin x  cos^(3/2)xsinx )dx Now you can make the t substitution described earlier and you will have integral of t^(1/2) t^(3/2) dt which can be integrated by power rule.
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