$\lim_{x\to b}\left(\frac{x^2-b^2}{\left|x-b\right|}\right)$
$\frac{\left(1+tan\left(x\right)\right)}{1+cot\left(x\right)}$
$-3x^2+42=-15x$
$\left(2s\cdot3s\right)$
$\sqrt{8mn}+2\sqrt{18mn}$
$12\cdot4-15-3$
$3 \cdot ( 6 - 2 ) - 14$
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