$4-2b=-2b+4$
$\int20be^bdb$
$\frac{x^{2\:}+1}{x^2}$
$\log\left(x\right)=-18.33$
$\lim_{x\to\pi}\frac{\sin\left(x\right)+\cos\left(x\right)+1}{\sin\left(2x\right)+1-\cos\left(2x\right)}$
$\int3^{4x+5}dx$
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