What is U-sub, and when do we have to use it? : r/calculus - Reddit
Oct 1, 2023 · Another perfect time to use U-sub. But if you have something like ∫ x 2 e x dx, notice you can't differentiate e x to get x 2, and you can't differentiate x 2 to get e x. Thus, U-sub will …
How to know what to use for u-substitution? : r/calculus - Reddit
In this case, u=sinx. And since the derivative of u=sinx is du=cosxdx, the integral can be easily rewritten as int[udu]. A quick antidifferentiation will give us ((u 2)/2)+C. At this point all you …
When to use normal integration, u-sub, and integration by parts?
Feb 2, 2021 · U sub: The main giveaway that you'll have a u sub is of theres some mix of a complicated function(s) being multiplied and one of them is a derivative of the other. (i.e. …
Why can't u-substitution always be done in "mentally" - Reddit
Oct 20, 2022 · U-sub doesn't magically introduce any inner derivatives, but my problem was that, while it's certainly possible to reverse the chain rule "mentally" for every function, some of …
Can somebody explain U-substitution to me as simply as possible?
Aug 4, 2010 · We can take the antiderivative of e u du and back-substitute to x. This is the way we must do things for an indefinite integral. Or we can rewrite the limits of integration in terms of u …
Why bother with u substitution? : r/learnmath - Reddit
Sep 27, 2019 · U-sub becomes much more useful when you think of it as an inverse chain rule. Solving problems like integral of cos(x)e sin[x] dx is an example of where you really should be …
How do I decide using u-substitution or integration by part
Apr 18, 2022 · Typically for a u-sub, you’ll see that the derivative of u is multiplied somewhere in the integrand already. Take the integral of cot(x) for example. We can rewrite this integrand as …
How do you know when to use u-substitution or trigonometric
Aug 16, 2020 · For this one, the teacher said that we should use u-substitution on 1-x^2. I did this and it took a lot less time to compute. But whenever I see a radical in the denominator and …
Am I right in thinking that if I need to add a negative when doing …
Sep 15, 2022 · Close: when you replace the integrand and dx with a function in terms of u and du, you need to change the bounds from x bounds to u bounds: Original: x = 0 to x = 1 Change: u …
When do you adjust limits of integration when doing ... - Reddit
Sep 27, 2019 · For example you have to use substitution method for the integration of sqrt(1+45t) from 0 to 3. But when you do u=1+45t, those limits of integration should change to from 1 to …