$\cos65\frac{y}{13}$
$16m^2-81n^2$
$n+n$
$2\int_0^x\left(e^{5x}\right)dx$
$\left(x^2-x-1+\frac{3}{x+1}\right)-\left(2x^2-3x+5\right)$
$\frac{d}{dx}\left(\frac{x-7}{1+x}\right)^{10}$
$3x^2+3x-2x-2$
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