$34-11c-7+2c$
$3a-7b-2a+5b$
$\left(+24\right):\left(-10-+2\right)$
$z=\frac{x^2}{y}$
$\frac{1-\tan\left(a\right)}{1-\cot\left(a\right)}=-\tan\left(a\right)$
$\lim_{x\to0}\left(\frac{7\:cos\left(0.1\right)-7\:}{0.1}\right)$
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