$4x-x-2x$
$\frac{cos^2x}{1-\sin x}-1=\sin x$
$\left(ux-ty\right)^2$
$\left(x^4\right)\left(3x^3-2\right)\left(4x^2+5x\right)$
$\left(1-y^4z^5\right)\left(1+y^4z^5\right)$
$\left|3\:4\right|$
$18x+24y$
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