$-8x^3y\left(-9x^3y^2\right)$
$2\cos^2\left(\frac{x}{3}\right)-1$
$49x^2+98x+2401$
$\frac{\left(-1+sin^2x\right)}{cosx}$
$28x^3-24x^2+12x$
$x^2-60x+50$
$x^2+6x-168=0$
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