$x^2\:-\:20x\:+\:x^2\:+\:3x\:$
$4.4^2.4^0$
$2,1a^{x+1}-0,9a^{x+1}$
$\frac{dy}{dx}=y^2\left(1-e^{-x}\right)$
$\left(\frac{5}{7}p\:-\frac{1}{7}q\right)^2$
$\frac{4x^3-2}{x^2-1}$
$8\cos^2\left(x\right)=3-2\cos^2\left(x\right)$
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