$x^4-9x^2+52$
$\int_0^{\infty}\left(\frac{1}{a^2+x^2}\right)dx$
$-6n-7n$
$\int\frac{1}{9x^2+18x+10}dx$
$\int_0^{\infty}\left(\frac{1}{x^{0.9}}\right)dx$
$6-\left(1-x^2\right)=14$
$\frac{x-1}{x+5}-2\ge0$
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