Why my integral is not displaying bigger with react-better-mathjax?

Question

I'm using react-better-mathjax and when i display integrals, it is not displaying as it should.

As-to-say bigger....

It displays this :

Instead of that :

Here is the code :

var mj = "\\(V_{\\frac{1}{2}sphere(h)} = \\int_0^R \\pi(R^2 - h^2) dh \\)";

return (
          <MathJaxContext>
              <MathJax dynamic hideUntilTypeset={ "every" } >
                  {mj}
               </MathJax>
           </MathJaxContext>
    );

Maybe it's a Latex problem, but I didn't find the answer on the documentation.

Can somebody help me please ?