$y^2+50y+100$

$-2.035-1.008-3.04+0.008$

$\frac{dy}{dx}=\left(\cos\left(x\right)\right)\left(\cos\left(y\right)\right)$

$21\cdot\frac{\sqrt{-5}}{3}$

$\int\frac{x+3}{\left(x^2-49\right)}dx$

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

$\frac{1}{2}x^2.\frac{2}{8}xy.\frac{5}{6}y^2.-\frac{1}{8}xy.\frac{8}{4}x^2.-\frac{5}{6}y^2.$