$\cos\left(\pi-2x\right)$
$2a^4-32$
$4.5-29.26$
$\frac{x}{2}+17=8$
$2x^4-7x^3-14+8$
$30-\left(18-8\right)$
$\frac{2x^3-7x^2+8x-3}{2x-3}$
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