$\sec\:^2\left(\frac{\pi\:}{4}\right)+\csc\:^2\left(\frac{\pi\:}{4}\right)$
$2.1\cdot17$
$\left(21\right)\cdot\left(-50\right)\cdot\left(-2\right)\cdot\left(-10\right)$
$\lim_{x\to\infty}\left(\ln\left(\frac{4x}{x+4}\right)\right)$
$\lim_{x\to\infty}\left(\frac{x^3-2x^2+3}{2x+1}\right)$
$-3-5-\left(-12\right)-1$
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