$\frac{dy}{dx}=\frac{1}{e^{3x}}$

$-6mn+9$

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

$\frac{4}{a+4}+a$

$\tan\left(x\right).\:\cos\left(x\right).\:\csc^2\left(x\right)$

$\lim_{x\to\infty}\left(\frac{\arctan\left(x^2\right)}{x^2-2}\right)$

$\left(2p+q\right)\left(2p-q\right)+\left(q-2p\right)\left(q+2p\right)$