$\lim_{x\to\infty}\left(\frac{x+1}{k}\right)$
$\csc x-1=0$
$\left(-25\right).\left(-17\right).\left(+6\right)$
$10x-40=20$
$ab-2a-5b+10$
$\left(3-5v\right)^2$
$\left(+5\right)+\left(-13\right)-\left(-21\right)$
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