$\frac{dy}{dx}=xy-2y-2$

$\left(11a+7b^4\right)\left(11a-7b^4\right)$

$\frac{d^3x}{dt^3}+2\frac{d^2x}{dt^2}-\frac{dx}{dt}-2x=0$

$5\cdot\left(-3\right)-6\cdot\left(-3^2\right)\left(-2\cdot1+6\cdot\left(-3^3\right)\right)-6$

$1-2sen^2\:y$

$x^2+x-240$

$\int\frac{6}{1+x^4+2x^2}dx$