# Intergration....plz help

• Mar 28th 2008, 08:10 AM
sweetchocolat113
Intergration....plz help
Intergrate....

1. x^5-2x+5 diveded by x^3 dx
2. √x (1+√x)^3 dx
3. (1-3x)^9 dx
4. sin2xcosxdx
5. x + 2x^3 diveded by (x^4 + x^2)^3 dx
• Mar 28th 2008, 08:38 AM
ThePerfectHacker
Quote:

Originally Posted by sweetchocolat113
1. x^5-2x+5 diveded by x^3 dx

$(x^5-2x+5)/x^3 = x^2 - 2x^{-2} + 5x^{-3}$. Now integrate each term.
Quote:

2. √x (1+√x)^3 dx
Let $\mu = 1+\sqrt{x}$.
Quote:

3. (1-3x)^9 dx
Let $\mu = 1-3x$
Quote:

4. sin2xcosxdx
Double angle, $2\sin x\cos^2 x$ and let $\mu = \cos x$.
Quote:

5. x + 2x^3 diveded by (x^4 + x^2)^3 dx
Let $\mu = x^4+x^2$.
• Mar 28th 2008, 04:42 PM
sweetchocolat113
Intergrals,....
can u please work out them completely so i can have an idea what to do?
• Mar 28th 2008, 04:47 PM
iknowone
Do you mean "Can you please work them out completely so I can copy the work and turn it in as my own?"

ThePerfectHacker has given you the all of the problems you have asked, meaning all the thought required has been done for you. Now all you have to do is pretend to be computer and go through the algorithm of integrating basic functions.
• Mar 28th 2008, 06:37 PM
sweetchocolat113
tru
tru