$x^2\cdot\frac{dy}{dx}=-y-yx$

$\lim_{x\to+\infty}\left(\frac{\sqrt{4x^2+6x^4}}{3x+x^2}\right)$

$\lim_{x\to0}\left(\frac{8sinx^2}{x}\right)$

$\int\frac{x^2+7x+14}{x+3}dx$

$\sqrt{7}\cdot\frac{3}{\sqrt{7}}$

$\left(16x\right)\left(-x^2+3\right)$

$x^2\left(3x-5y\right)\left(3x-8y\right)$