$2xcos\left(3x\right)-\left(x+2\right)^2$
$5-2n+4n$
$\left(2-a\right)c^2+\left(2-a\right)d^5$
$^{\infty}e-1$
$\lim_{x\to\infty}\left(2x-\sqrt{4x^2-3}\right)$
$x^2+18x-3=0$
$0.5>=2p$
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