# Thread: Is there a chain rule for intergration?

1. ## Is there a chain rule for intergration?

What would be the rule for something like this?

$$\int_4^6 \left(\frac{d}{dt}\sqrt{4 + 4 t^4}\right)\, dt$$

2. You can take the derivative of $\sqrt{4 + 4 t^4}$ and integrate the result?

3. $\displaystyle \int_a^bf'(x) dx = f(b)-f(a).$

4. wait..I got it. At least I think I got it.

$\sqrt{4}\int_{4}^{6}\frac{1}{(1+0)}t^{1+0}+\sqrt{4 }\int_{4}^{6}\frac{1}{(1+4)}t^{4+1}$

Nevermind I got it from the above post.

5. Originally Posted by TheCoffeeMachine
$\displaystyle \int_a^bf'(x) dx = f(b)-f(a).$
To make it crystal clear for the OP, I'd state it as $\displaystyle \int_a^b \frac{df}{dx} \, dx = f(b)-f(a)$.

6. $\int_{ 2 } ^ { 7 } (2 x + 8) dx$

I think something like this is what I take the anti-derivative of.

Yeah I got it now, I just now have to deal with a long tedious task of entering in the answers.

This is a lot easier than reimann sums

7. The "chain rule for integration" (i.e. the inverse of the chain rule) is "substitution".