$\frac{x}{3-x}\ge27$

$\left(\frac{4}{5}x^5-4\right)\left(\frac{4}{5}x^5+3\right)$

$\left(3a-4b^3\right)^3$

$\int\frac{1+x^2+x^3}{x\left(3x+2\right)}dx$

$24cos^2\left(t\right)=6cot\left(t\right)sin\left(t\right)\:$

$0^2-3$

$\frac{d^2}{dy^2}\left(e^{-x}\cos\left(y\right)-e^{-y}\cos\left(x\right)\right)$