$\frac{\sin\:\left(\theta\:\right)}{1-\cos\:\left(\theta\:\right)}=\frac{1+\cos\:\left(\theta\:\right)}{\sin\:\left(\theta\:\right)}$
$\frac{u}{10}-90=30$
$5x-3x^2+1$
$\cos\left(x^5\right)\:\sec\left(x\right)$
$50-\left(-25\right)$
$\lim_{x\to1}\left(e^{x-1}-6\right)$
$\frac{c+6}{2}+\frac{3}{2}=\frac{c+4}{2}$
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