$\frac{25}{9}x^2-49y^4$
$\frac{1}{5x+7}+5x+7$
$1-2-\left(-2\right)$
$\frac{dy}{dx}=\frac{x}{1+x^2}$
$\int x\cdot\cos\left(3x+2\right)dx$
$3-5+4-1$
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