$\lim_{x\to0}\left(\frac{3x^2\tan\left(3x\right)}{\sin\left(2x\right)-\sin\left(2x\right)\cos\left(3x\right)}\right)$

$\lim_{x\to2}\frac{x^2-4}{-x-2}$

$\int\frac{2}{x\left(x+1\right)\left(3-2x\right)}dx$

$\sqrt[3]{\frac{8x^5+7x^3-1}{27x^5+4x^4-6x}}$

$\frac{senx\left(cscx+cosx\right)}{cosx\left(secx+senx\right)}$

$6u^5-39u^4+18u^3$

$334+\left(-543\right)$