$\tan\left(\frac{a}{2}\right)+\cot\left(\frac{a}{2}\right)=2\csc\left(a\right)$
$\left(\frac{1}{4}-b\:\right)\left(\frac{1}{4}+b\right)$
$\left(-469\right)+71$
$\frac{6}{x^{\frac{1}{2}}}-\frac{15}{x^{\frac{4}{5}}}$
$6x^2-4x+3$
$-\left(7.2b+8c\right)+6$
$\frac{500}{4}$
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