$3\left(2x+5\right)-3\left(4+4x\le7\right)$
$\left(5\cdot8\right)\left(2\cdot10\right)\left(18\cdot18\right)-6$
$\lim_{x\to0}\left(\frac{\left(1-\cos\left(0\right)^2\right)}{2}\right)$
$2\cdot\:\lim\:_{x\to\:\infty\:}+\left(\frac{\sqrt{x}}{\sqrt{x}-1}\right)$
$\cot\left(x\right)+3=4$
$\left(9x+2\right)^4$
$e^x-e^{-x}-\left(x\cdot\:\:e^x\right)+e^{-x}$
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