$\frac{d}{dx}x^2+xy+2y^2=28$
$2abc-\frac{1}{5}a^2b+\frac{3}{7}ab^2-5abc-\frac{1}{2}ab^2+\frac{2}{3}a^2b$
$x2+x+1x+3$
$71\cdot\left(-97\right)$
$\int3ydx$
$x^2+1x+2$
$\lim_{x\to-\infty}\left(\frac{x-2}{x^2+3x-4}\right)$
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