$-2cos^2\left(x\right)=0$
$3x^2-3x-12=6x^2-6x-18$
$5x^2-10x^2-20x$
$\frac{dy}{dx}=\frac{-y^2}{1+x}$
$\left(3x^3+2b\right)\left(3x^3-2b\right)$
$\left(\frac{3}{2}ab^2-2a\right)^3$
$48>-8x-8$
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