$1-\cos\left(2\right)+\cos\left(8\right)-\cos\left(10\right)$
$\left(2x+3\right)^2=x^2+\left(3x-3\right)^2$
$\frac{dy}{dx}=\frac{y\left(y^2+2x^2\right)}{x\left(2x^2+2y^2\right)}$
$\frac{dy}{dx}=3x+1;\:y\left(0\right)=2$
$\frac{2x^21}{x^3-x}$
$\left(-6xy\right)+8x+7xy$
$25m^2+15m^3-5m^5$
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