$\int\left(\sqrt{9-x^2}\right)\frac{1}{x^2}dx$
$\frac{\left(1\right)}{x\left(x^4-1\right)}$
$\frac{n^3}{4^n}x^n$
$20+5\cdot38$
$\lim_{x\to0}\left(\frac{\log2x}{\log3x}\right)$
$\int20x^7dx$
$3+-2-6+5-9-12+-13$
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