$3,14\:\cdot\:6$
$\left(\frac{x}{2}-5\right)^2$
$\left(\frac{1}{cos\:a}+\frac{1}{cot\:a}\right)\left(\frac{1}{cos\:a}-\frac{1}{cot\:a}\right)$
$13a+13b$
$\int\frac{2x-7}{6x^2-85x+1}dx$
$\lim_{x\to4}\left(\frac{3-\left(x-4\right)}{x^2-16}\right)$
$\int\left(\frac{2x+5}{\left(3x^2+15x\right)^4}\right)dx$
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