$\int\frac{1}{x^3+5x^2+4x}dx$
$3\cdot.5$
$\frac{4a^2-20a^2b+36ab^2}{4a}$
$1-2\sin^2\left(90-e\right)$
$\int\frac{2x+1}{\left(x^2+5x+6\right)}dx$
$\int\left(\frac{3x^3-2x+1}{\sqrt{x}}\right)dx$
$\frac{5}{x}-\frac{1}{3}=\frac{1}{x}$
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