$x^4+4x^3-x^2-20x-20$
$\left(\frac{2}{5}x^2y+3xy^2\right)^2$
$2cos2x=-1$
$1\sqrt{5}$
$\tan\left(x\right)=\frac{\sin2\left(x\right)}{1+\cos2\left(x\right)}$
$p^2-2p-15$
$\left(3x-4\right)\left(3x+8\right)$
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