What is the syntax for the definte integral

[nameVoid]

?........

 

[Mark44]

Do you mean the LaTeX syntax? If so, rather than explain the syntax, I'll just create the script that renders in a browser as a definite integral. Double-click it and you can see what I did.

$$\int_{0}^{\pi} \frac{sin^2(x)}{3} dx$$

If that's not what you're asking, you'll need to be more clear.