$81v^3-900v=0$
$\frac{s^2}{s^3-1}$
$\int\left(9x^2+27x+45\right)^2\left(2x+3\right)dx$
$\frac{y^2+3y-11}{y+5}$
$\left(2x\right)^2-\left(\sqrt{2}\right)^2$
$\int\frac{25\left(25+x^2\right)^{\frac{3}{2}}}{x^6}dx$
$\frac{1}{1+cos^2x}+\frac{1}{1+\frac{1}{cos^2x}}=1$
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