$6u+14$
$\sin\sqrt{20s^2t^9}$
$\frac{\left(\frac{1}{\sin\left(x\right)\cos\left(x\right)}\right)}{\left(\frac{1}{\cos\left(x\right)}\right)}$
$4.754+4.871$
$26-\left(-48\right)$
$\frac{x-1}{x+1}-\frac{3+x}{x-1}$
$\lim_{n\to\infty}\left(\frac{1-\sqrt{2n}}{n}\right)$
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