$\left(-3a^{n+4}b^{n+1}\right)\left(-4a^{n+2}b^{n+3}\right)$

$6\cdot a^3.f,\:a=2,\:b=5,\:c=3,\:d\:=-1,f=0$

$4x^5\:-\:30x^4\:-\:16x^3$

$\lim_{x\to1}\left(\frac{1}{3x-2}-\frac{1}{\ln\left(x\right)}\right)$

$4x^2\:dx\:+y^2e^{-x}\:dy\:=0$

$\frac{\left(0.111+\frac{0.3}{0.363636}\right)}{1-0.2}$

$4tan\left(x\right)+4=0$