$\csc\left(-z\right)$
$\lim_{x\to0}\left(\frac{25}{x^2}\right)$
$3x+4y=8$
$\int3c^{-5x}dx$
$\int\frac{4}{\left(x-3\right)\left(x+1\right)^2}dx$
$\int\sec^5\frac{1}{2}x\tan\frac{1}{2}xdx$
$8x+4^2$
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