$15c^4d-3cd$
$9x^2+4x-3x^2+3x$
$-3x-5\le4-x$
$\lim_{x\to0}\left(\frac{arctan\left(x\right)+3x^{\frac{1}{5}}}{x^{\frac{1}{5}}}\right)$
$\cot\left(b+\csc\left(b\right)\right)$
$2x+5x+6-1$
$\csc\left(x\right)=\frac{17}{8}$
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