/sci/ - Science & Math

No, this is Patrick.

>>3003693

yes, pay attention

>>3003727

Why is that whore sticking the negative sign in front of the du?

>>3003744
Because du is -dx. And dx is then -du.

>>3003744

>baby's first substitution

>>3003756

Then it should be:

<span class="math">\displaystyle u = 1 - x[/spoiler]
<span class="math">\displaystyle u' = -1dx[/spoiler]
<span class="math">\displaystyle -du = dx[/spoiler]

<span class="math">\displaystyle -\int_{1}^{\frac{1}{4}}\frac{1 - u}{\sqrt{u}} du[/spoiler]

The aforementioned whore even moved the negative outside the integral while rewriting/simplifying the numerator.

>>3003761
>he thinks I'm new to math

>>3003808

she removed the minus sign because she reversed the limits of integration

>>3003812

What are you smoking.

And what the FUCK is she about to write out? Why is she sticking a parenthesis there when you should just integrate the terms separately.

And the negative sign disappeared again.

BITCH GET BACK IN THE KITCHEN.

>>3003810
>u'=du

>>3003821
>>3003821
>http://www.youtube.com/watch?v=qFoa3jbVG3U&

god you're dumb as shit

>>3003837

You mean like how she decides to change the bounds of integration when she could have just re-substituted before evaluation of the definite integral?

Changing the bounds of integration is a sign of mouth breathing. Get it checked.

Admittedly, though, she does use <span class="math">\displaystyle \int_{a}^{b} f(x)dx = -\int_{b}^{a} f(x)dx[/spoiler]...but that still doesn't mean you stick the negative sign in front of the fucking du.

1:48 "And I'm going to take the minus out front"

Oh, you mean like you should have done to begin with?

And she doesn't properly format her bounds of integration after she performs the integration in terms of u.

>>3004030
>>3004000

I know this is 4chan but PLEASE tell me you're trolling. Nobody can be this retarded

>>3004054
>probably didn't realize there are two ways to deal with bounds when evaluating definite integrals via substitution

>>3003837
>mfw this chick keeps saying the integral is from the upper limit to the lower limit instead of the other way around
>mfw I'm too busy fapping to care