$\lim_{n\to\infty}\:1+\left(2\right)^{2n}$
$\frac{d}{dx}\:\frac{e^x-1}{e^x-1}$
$\left(+21\right):\left(-3\right):\left(-7\right)$
$-11-\left(-2\right)$
$10x=120$
$\left(b+a\right)^3-5\left(a+b\right)+2$
$3x-5x^2-\left(2x^2+3x\right)$
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