$x+11=-23$
$\frac{cot\:\theta\:}{1-sin\:\theta\:}=\frac{1}{sin\:\theta\:\:cos\:\theta\:}+\frac{1}{cos\:\theta\:}$
$\left(5a+12\right)\left(5a-12\right)$
$\frac{1}{\tan\left(\frac{\pi}{2}\right)}$
$\lim_{x\to y}\left(\frac{\sin\left(2x\right)-\sin\left(2y\right)}{\tan\left(x\right)-\tan\left(y\right)}\right)$
$-48-16y$
$\left(5y-4\right)\left(2y+3\right)$
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