$\pi\int_0^4\left(-\sqrt{y}+2\right)^2dy$

$\frac{dy}{dx}=y\sin\left(x\right)+xy$

$\lim_{x\to0}\left(\frac{1+\frac{4}{x}}{1-\frac{2}{x}}\right)$

$\lim_{x\to\infty}\left(\frac{x^3+x+2}{x^2+1}\right)$

$x-2=4$

$-4-5-6-7-9-1$

$\lim_{x\to\infty}\left(\sqrt{\frac{3x^2-2x^6+5x-3}{-4x^3+2-4x^2-x}}\right)$