$a+2b-b$
$\frac{\left(1+x^2\right)}{\sqrt{x}}$
$3x^2-x+x^2-1$
$\frac{cos\:a}{sin\:a}$
$1.4683+0.838+\frac{17}{92}-\frac{5}{256}$
$\left(17+5\right)\cdot\frac{4}{8}$
$\frac{dy}{dx}+\frac{1}{x}\left(y\right)=\frac{1}{x^2}$
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