$\frac{dc}{dt}=\frac{9-6c\left(t\right)}{400}$

$p^3\left(3+2pq^3\right)^2$

$\frac{\log\left(2x-1\right)}{\log\left(4x-3\right)}=1$

$\left(x-2\right)\left(x+13\right)$

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

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

$\left(\frac{-4b}{a^2}\right)^3$