$\lim_{x\to\infty}\left(\sen\left(\frac{\pi}{x^{2}-1}\right)\right)$

$-10sin\left(wt+30\right)+20cos\left(wt-45\right)$

$\int_0^1\left(\frac{\left(\arctan\left(x\right)\right)^2}{1+x^2}\right)dx$

$x^2+x<x+2$

$\sqrt{180x^8y^{19}}$

$\sqrt{4x^2}-\sqrt{9y^2}^2$

$13-\left(-17\right)$