$-4.\frac{4-a}{a}$
$\left(-2y\right)\left(8x-5y\right)$
$2\left(x-2\right)+3\left(4x-3\right)\ge6x$
$-x^2+1\ge0$
$\left(\frac{x}{2}+\frac{y}{4}\right)\left(\frac{x}{2}+\frac{3y}{y}\right)$
$2x+7\le4-x$
$\lim_{x\to\frac{3.14}{2}}\left(\cos\left(x\right)\right)$
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