$\frac{COS^2\theta\:\:\:}{COT\frac{\theta\:\:\:}{2}-tan\frac{\theta\:\:\:}{2}}=\frac{1}{4}sin\left(2\theta\:\right)$
$\csc\left(x\right)\left(\csc\left(x\right)-\sin\left(x\right)\right)=\cot^2x$
$-\left(89\right)-\left(-34\right)+75+83$
$3\cdot3\cdot4$
$-6y^3+y^3$
$\lim_{x\to\infty}\left(\frac{2x-1}{x-3}\right)$
$140-7$
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