$\left(\sqrt{3}+5\right)\left(\sqrt{3}-5\right)$

$-8-3+1-6+10$

$y'+4y=e^{-4t}\:;\:y\left(0\right)=2$

$\frac{13m^3+15m+6m^4-6}{2-m+2m^2}$

$\lim_{x\to+3}\left(\frac{\ln\left(x-2\right)}{2x-6}\right)$

$-6\left(-3\right)+2\left(-8\right)-5\left(6\right)+\left(9\right)$

$121-y^6$