$\int\frac{\left(x^3\right)}{\left(2-x^2\right)^{\left(\frac{1}{2}\right)}}dx$
$\frac{2x^2}{x^2-1}$
$x^2-3x+2-1$
$2+x<-5$
$3x^3+3x^2-36$
$\int\frac{1}{x\sqrt{4+81x^2}}dx$
$\int_2^4\left(\sqrt{16-x^2}\right)dx$
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