$4a+9b-10a+15b$
$\frac{dy}{dx}=4\left(1+y^2\right)x^4$
$\pi-\pi$
$2h-2h^2$
$\frac{5x^2+x-4}{x^2\left(x+1\right)}$
$\sqrt{x-1}\cdot\sqrt{x+1}$
$\left(m-2\right)^2=\left(m-4\right)^2+\left(m-3\right)^2$
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