$\frac{0.4}{0.8}$
$\frac{3x^3+16x^2-2x+5}{x-1}$
$\frac{3b^2}{3b^2}$
$\int4y+2x-5dx$
$\frac{cos}{1-sen}-sec$
$\frac{1}{\left(n+1\right)\left(n+2\right)\left(n+3\right)}$
$x^2+18x+16$
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