$50x^2-254x+300$
$\left(3x^4-5x^2\right)^2$
$\cos^2x+2\cos\left(-x\right)$
$\frac{d^3}{dx^3}\left(\frac{1}{12}+2x^2-x^3-\frac{1}{4}x^4\right)$
$\left(-3xy\right).\left(-2xy^4\right)$
$-56\cdot11$
$-3+-6^2+\left(-2^5\right)$
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