$3-5+265-418-5$
$\int\left(\frac{2x}{x^2-4x+5}\right)dx$
$25x^4y^2-121$
$g\left(x\right)=\sqrt{2x+7}\cdot\left(x^{2}-7\right)^{2}$
$\int\left(\frac{1}{y^2+y}\right)dy$
$\frac{x^3+x^2-1}{x^2+x}$
$\int\left(x^4-81\right)^5x^3dx$
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