$\int\left(\frac{2x+1}{x^2+1}\right)dx$
$5\:+\:2x\:+\:y\:+\:2x\:-\:1\:$
$-14530+-365$
$\frac{dy}{dx}=\frac{2y+x}{2x-y}$
$\lim_{x\to5}\left(\frac{x^2-25}{x^2-15x+50}\right)$
$1-0.3$
$-\:x\:+\:y\:+\:y\:-\:x$
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