$\frac{dy}{dx}=\frac{\left(-xe^{3y}\right)}{3}$

$\int\frac{4x-3}{\left(x^2+1\right)\left(x-1\right)}dx$

$a^2\cdot b+5a-3b;\:a=3;b=-1$

$\left(6b-1-3\sqrt{b}\right)\left(6b-1+3\sqrt{b}\right)$

$\int\left(2x+5\right)\left(x^2+5x\right)^2dx$

$\left(3x^{-1}\right)\left(x^{-1}\right)$

$4a-20b$