$\frac{d}{dx}\frac{e^{3x}}{e^{-x}+2}$

$\int x^2\cdot\left(3+3x^3\right)^6dx$

$\frac{cos\left(x\right)}{1-sin\left(x\right)}-tan\left(x\right)=cos\left(x\right)$

$10n^2100n+250$

$\frac{\frac{1}{27}x^{12}-\frac{8}{27}y^6}{\frac{1}{3}x^4-\frac{2}{3}y^2}$

$\left(m+n+p\right)-\left(a+b+c\right)$

$-2\cdot2-1$