$\lim_{x\to\pi}-\frac{\left(sin\left(x\right)\right)}{\left(1-cos\left(x\right)\right)}$

$m-2m$

$\left(3b+2y\right)\left(3b+2y\right)$

$\lim_{x\to\infty}\left(\frac{e^x-1}{sin\left(15x\right)}\right)$

$\sqrt{18m^3}n^4\cdot\sqrt{2m^3}n^2$

$\sen^{3}\left(\sin\right)\cos^{2}$

$\left(3x^2-2a\right)^3$