$\frac{z+78}{2}=20$
$\frac{d}{dx}e^x\left(5+7\sqrt{x}\right)$
$2\sin2x\cos2x$
$5\:\left(r\:+\:1\right)$
$-657-854-83-1248-3568$
$\left(+2\right)-\left(-4\right)$
$sin\left(270-a\right)$
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