$\int\frac{1}{x\left(1+lnx\right)^3}dx$
$x^2-9^2$
$-x^2+9y+x^2-8y$
$x^2+4x>0$
$\int_{f-1}^2fdx$
$-3-4-6-11+4+8+9-10$
$3\sec\left(x\right)=\sec\left(x\right)$
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