$2m^2+4m-2$

$\frac{120}{-60}$

$\frac{\left(-1\right)^n}{n\cdot3^{n\:}}\left(x-2\right)^{2n}$

$15ax+15x$

$\frac{\left(1+sin\right)}{\left(1+csc\right)}$

$\lim_{x\to\infty}\left(x^3\left(\frac{4}{x}-sin\left(\frac{4}{x}\right)\right)\right)$

$\cos\left(x\right)\tan\left(x\right)^2=\cos\left(x\right)$