$\lim\:_{x\to\:\frac{\pi\:}{2}}\tan^2\left(x\right)\left[1-\sin\left(x\right)\right]$
$4x+20=5\left(x+5\right)-x-5$
$2\sqrt{3}+7\sqrt{3}$
$\frac{1}{2}x+\frac{5}{4}>\frac{3}{8}x-\frac{1}{16}$
$\left(4a-5c\right)\left(7a+2c\right)$
$\sqrt{48x^5y^{17}}$
$1\cdot2-\left(-3\right)\cdot2$
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