$x^2+2xy+y^2-16$
$-5a+b-4a+b$
$x^2e^-x$
$\frac{\left(1+tany\right)dy}{dx}=x^2+1$
$+9-12+5-13+66-7-15$
$\frac{2x^4+7x^2-3x-7}{x+8}$
$\frac{1}{16}-\frac{4x^2}{49}$
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