$\frac{x^2}{\left(1-x^2\right)}$
$6\left(a-2b\right)-3\left(4a+b\right)$
$2cos^22x-7cos2x+3=0$
$\frac{dy}{dx}=10-\frac{y}{4},y\left(0\right)=0$
$4m^2-81n^2$
$\left(44-s\right)^2$
$548,56-297,78$
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