$\int_0^{e^{-1}}\left(\frac{1}{x+1}\right)dx$
$4x^4+4y^4=16$
$\sqrt{x^2y^2}$
$\int\frac{x^2+1}{\left(x^2+2\right)\left(x-2\right)}dx$
$100x^2-80+16$
$\frac{d^2}{dx^2}\left(\frac{7}{x^5}-\frac{9}{x}\right)$
$7x=15-2x^2$
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