And so let's see, we want to do definite integrals so that I can click math right over here, move down. So this function f n integral, this is a integral of our function or a function integral right over here, so let me press enter. And the way that you do it is you first define the function, then you put a comma, then you say what variable is the variable that you're integrating with respect to, and then you put the bounds of integration. So I'm going to write 20 sine of, and just because it's easier for me to input x than t, I'm going to use x, but if you just use this as sine of x squared over 35 dx, you're going to get the same value. So you're going to get x squared divided by 35, close that parenthesis, so that is my function there. Actually, I don't know if it's going to understand. Let me put the times, second insert times just to make sure it understands that.