$\int\frac{3x^3+x}{\left(x^2+1\right)^2}dx$
$98\cdot98$
$\left(x-2\right)\left(x+2\right)-\left(x-3\right)^2$
$x^2+26x+144$
$\frac{1}{ab}-a^2b^2$
$\frac{sin\left(x-y\right)}{cos\left(x\right)}$
$\int\frac{1}{x\cdot\sqrt{1-lnx}}dx$
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