# Thread: Evaluating a definite integral....

1. ## Evaluating a definite integral....

Evaluate:

$\displaystyle F(x) = \int_{x}^{6} \sin(t^{4}) dt$

I = ?

2. Originally Posted by derekjonathon
Evaluate:

$\displaystyle F(x) = \int_{x}^{6} \sin(t^{4}) dt$

I = ?

What's I?

Tonio

3. ## I guess I is just the solution...

As far as I can tell, you are only supposed toe valuate the integral, but I am not sure how to do that.

4. Originally Posted by derekjonathon
As far as I can tell, you are only supposed toe valuate the integral, but I am not sure how to do that.

I'm 99.45688% sure that integral doesn't exists as an expression with a finite number of elementary functions...Now, if it were that I = F'(x) then we do NOT need to know what the integral to solve the question...but we don't know what I is.

Tonio

5. ## Thank you for your help! For the...

second part of the question I AM supposed to find F'(x).

What are the steps involved in determining the derivative?