$-\left[+5-\left[\left(7-5\right)\right]-8\right]$
$\frac{cotx^2}{cosx^2}=\frac{1}{sinx^2}$
$b^2-a^2$
$\lim_{x\to\infty}\left(\frac{x^3}{2x^2+1}-\frac{x}{2}\right)$
$\left(\frac{3}{5}\right)^{\infty}$
$\left(\sqrt{x+1}\right)^2$
$\left(3b^2-2\right)\left(b+4\right)$
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