$\left(2.3\right).7$
$2306-15238$
$\frac{5x^2}{x^3-3x^2+3x-1}$
$\int21x\sqrt{x^2+9}dx$
$\left(x^2-k^2\right)-4\left(k+1\right)$
$\int\frac{7\sqrt{x^2-25}}{x^4}dx$
$\int\left(\sqrt{x}^3-\sqrt[3]{x^2}\right)dx$
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