$\lim_{x\to\infty}\left(\sqrt{x^2+6x+20}-x\right)$

$5xy-3y+2x-y+4x-5xy$

$\frac{dy}{dt}=1+\frac{1}{y^2}$

$0x\:+\:3y\:+\:4x\:+\:5y$

$\sin^2e\left(\cos e+\tan e\right)\left(\cos e-\tan e\right)=1-\tan^2e$

$\left(\frac{3}{8}x^2+\frac{1}{4}x-\frac{2}{5}\right)\:por\:2x^3-\frac{1}{3}x+2$

$\frac{\frac{4.1}{4.1+1}-\frac{4}{5}}{4.1-4}$