$\lim_{x\to0}\left(\frac{\ln\:\left(1-e^x\right)}{\ln\:\left(x\right)}\right)$

$\frac{64a^3-343}{4a+7}$

$8m-m^2-9-3m+4m^2+5$

$\frac{dy}{dx}=\frac{x\left(4+y^2\right)}{-y\left(1+x^2\right)}$

$\left(x^6-49y^6\right)\:\:\left(x^3+7y^3\:\:\right)$

$\left(2a+9b\right)^2$

$4x^2yz\:\:\:\:\:\:;\:\:\:x=1\:\:;\:\:\:\:y=2\:\:\:\:;\:\:\:\:\:w=3\:\:\:;\:\:\:\:z=\frac{3}{2}\:\:\:$