$\left(-1\right)\left(-12\right)-12\cdot\left(-3\right)$

$\frac{\left(3x^2+5\right)}{\left(\left(x-1\right)\left(x+1\right)^2\right)}$

$\int\left(e^{-1}\sin\left(x\right)\right)dx$

$\frac{dy}{dx}=3xy^2$

$\lim_{x\to0}\left(\frac{1-x-lnx}{1+cos\left(\pi x\right)}\right)$

$cos2x+5sinx+2=0$

$\left(x+2\right)\left(x+3\right)\left(x+8\right)$