$x\left(x^3+3x-8\right)+5+4x^3$
$\int\sec^7\left(x\right)dx$
$a+a^2$
$\frac{2,5^{-4}}{7,5^{-4}}$
$a^2+33-149$
$\int\left(\frac{\left(3x-5\right)}{\left(x-1\left(x^2-1\right)\right)}\right)dx$
$\int\left(\frac{1}{9x+2}\right)dx$
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