$\left(e^{2x}-2\right)\left(\ln\left(x-1\right)\right)=0$
$\left(mx+m+4\right)^2$
$\cos\left(21\right)\cos\left(59\right)-\sin\left(21\right)\cos\left(59\right)$
$3,025+0,21$
$y''+y'+1.25y=0$
$\frac{dy}{dx}+2xy=xe^{-x^2}y^3$
$\frac{-x^4-4x^3+5x-7}{x-2}$
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