$-20x^2+600x-4000$

$log\left(xy\right)$

$\int\left(\left(2x-6\right)\cdot sen\left(2x^2-12x+16\right)\right)$

$4-9n^2$

$csc^4\theta\:-cot^4\theta\:=2csc^2\theta\:-1$

$f\left(x\right)=\frac{x\left(5x+3\right)}{2-x^2}$

$\lim_{x\to0}\left(\frac{\sqrt{x+1}-2}{\sqrt{2x+3}}\right)$