$\csc^2\infty=\cot^2\infty+1$
$-\left(12\right)+\left(-\left(-12\right)\right)$
$-\frac{8c^{-2}}{2c^3}$
$\lim_{h\to2}\:8-4h$
$7y\:+\:2z\:-\:5y$
$\frac{6-\tan\left(x\right)}{6\csc\left(x\right)-\sec\left(x\right)}$
$\left(4x^{\left(5\right)}+5y^{\left(6\right)}\:\right)^{\left(2\right)}$
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