$\csc u-\cot u$
$5x-2^2$
$\lim_{x\to3}\left(7x^2-3x+4\right)$
$\lim_{x\to\infty}\left(\frac{9x}{x-1}-\frac{9}{ln\left(x\right)}\right)$
$6a+13c+0$
$6=-y+1$
$2^2-2\cdot2\cdot3+4$
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