$\left(\cos^2\right)x-2cos\:x=0$
$a^2-2a+2$
$x-5\cdot x+5$
$x^2\left(x-1\right)^3$
$\left(x^4\right)\left(\frac{1}{x}\right)$
$\frac{dy}{dx}=3x-7$
$x^4+4x^2+10$
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