$\left(43x+86\right)^2$
$\lim_{x\to-\infty}\left(\frac{\sqrt{4x^2+1}-\sqrt[3]{27x^3-x}}{2-25x}\right)$
$\frac{9^2}{9^2}$
$\frac{\cos x\sec x}{\csc x}+2\senx=\senx$
$\int_0^{\infty}\left(\frac{x^{-1}+x^{-2}}{1+x^2}\right)dx$
$\lim_{x\to\infty}\left(\frac{\sqrt{x^5+1}}{x^7+1}\right)$
$-cos\left(\frac{\pi}{2}+x\right)$
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