Here is an equation based on integration over \(x\). This is a test.

$$I_{\xi}=\int_{0}^{+\infty}\mathrm{d}x\,\,\left[\frac{\sin\left( x^2 \right)}{1+x^\pi} \right]$$

Here is an equation based on integration over \(x\). This is a test.

$$I_{\xi}=\int_{0}^{+\infty}\mathrm{d}x\,\,\left[\frac{\sin\left( x^2 \right)}{1+x^\pi} \right]$$