$\cos^22x-\sin^22x\cdot\cos^22x$
$1+\left(x+1\right)\left(-x^2+2x-2\right)$
$x^2+x+1\ge0$
$\sqrt[7]{\frac{d}{b^2}}$
$16-y^2$
$\frac{x^4-3x^3+2x^2-x+1}{x-2}$
$4x^3-5x^2$
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