$\cot\left(\frac{b}{2}\right)=\frac{1+cos\:b}{sen\:b}$
$-3+7c+2c-5$
$-3b^2-2b^2$
$2\left(x^4\right)^{\frac{1}{2}}$
$10\left(12\right)-\left(-8\right)+\left(-23\right)$
$\lim_{x\to1}\left(\frac{lnx}{20x-x^2}\right)$
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