$\lim_{x\to0}\left(\frac{x^2-1}{tan\left(x+1\right)}\right)$

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

$\frac{\cot\left(x\right)\cdot\tan\left(x\right)-\sin\left(x\right)}{\sin\left(x\right)\cdot\cot\left(x\right)}$

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

$\left(\sqrt{1-x}\right)\left(\sqrt{1+x}\right)$

$9m^2+12m+4m$

$8x^2-32x+16$