$3x^3-33x^2+84x$

$\frac{da}{dx}=x-\frac{1}{5}a$

$3x\cdot\frac{dy}{dx}\:=\:1\:+\:\ln\left(x\right)$

$-15+-54$

$\frac{d}{dx}\left(y=\frac{\cosh\left(x\right)}{1+\mathrm{sech}\left(x\right)}+\log\left(\mathrm{sech}\left(x\right)+\mathrm{sech}\left(3x^2+1\right)\right)\right)$

$\int\frac{1}{8-5x}dx$

$4x^4\left(-2+x^2-3x\right)$