Hey guys, how would you do these? For all of these I can't figure out a way to cancel out the x's after I find u and du.

(x+1)^3/(x^2)dx

(x+1)/(x^2) dx

1/(1+4(x^2)) dx

x(x-10)^10 dx

(cosx)/(1+(sinx)^2) dx

(1+tanx)^3/(cosx)^2

Thanks :)

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- January 7th 2010, 02:34 PMali2141U-Substitution Integrals
Hey guys, how would you do these? For all of these I can't figure out a way to cancel out the x's after I find u and du.

(x+1)^3/(x^2)dx

(x+1)/(x^2) dx

1/(1+4(x^2)) dx

x(x-10)^10 dx

(cosx)/(1+(sinx)^2) dx

(1+tanx)^3/(cosx)^2

Thanks :) - January 7th 2010, 02:40 PMDrexel28
- January 7th 2010, 02:42 PMpickslides
- January 7th 2010, 02:43 PMadkinsjr
- January 7th 2010, 02:56 PMali2141
I was trying to use u-substitution.

Wait, so you mean do: x^3/x^2 + 3x^2/x^2 + 3x/x^2 + 1/x^2 ?

What would be the answer to that then? - January 7th 2010, 03:12 PMadkinsjr
- January 7th 2010, 03:20 PMali2141
No, I get that if you have x^3, the antiderivative would be x^4/4

But I don't know how that would apply to something like x^3/x^2 - January 7th 2010, 03:24 PMpickslides
- January 7th 2010, 03:26 PMali2141
oh wow. (Headbang)

okay, i feel like an idiot now. - January 7th 2010, 04:22 PMTWiX
- January 7th 2010, 04:39 PMProve It
- January 7th 2010, 04:46 PMTWiX
- January 7th 2010, 04:48 PMProve It
- January 7th 2010, 04:51 PMProve It
- January 8th 2010, 10:10 AMroshanhero
I am sorry but shouldnot there have been