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1. hey can someone help me to integrate the following: pleaseee..
(any help appreciated)

(sinx)/(cosx)^4
2. (Original post by going_crazy12)
hey can someone help me to integrate the following: pleaseee..
(any help appreciated)

(sinx)/(cosx)^4
To clarify, you do mean right?

You can rewrite the function in terms of tan(x) and sec(x) and then use a substitution.
3. (Original post by going_crazy12)
hey can someone help me to integrate the following: pleaseee..
(any help appreciated)

(sinx)/(cosx)^4
I would convert (cosx)^4 to (cos(x)^2)^2 and then use an identity to change cos into sin, and then make the substitution.
4. Or note that -sin x is the derivative of cos x
5. thnks for the replies guyz but could any of u solve the whole thing.. pls..
6. (Original post by going_crazy12)
thnks for the replies guyz but could any of u solve the whole thing.. pls..
No, do it yourself There's an "obvious" substitution to make (at least, it's obvious if you spot it), and it's made even more obvious by SimonM's post.
7. (Original post by SimonM)
Or note that -sin x is the derivative of cos x
thank u simon,
i was using this method but i got stuck after.. really confused
8. (Original post by going_crazy12)
thank u simon,
i was using this method but i got stuck after.. really confused
If you want more help you'll have to show us your working, then we can tell you where you're going wrong or give you a poke in the right direction [but not do the whole thing for you].

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Updated: April 11, 2011
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