$\left(2n+5\right)\left(2n-9\right)$
$\left(5x^3-2\right)^2$
$\lim_{x\to0}\left(\frac{-4x^3+5x}{2x^3+7}\right)$
$\lim_{f\to\infty}\left(\frac{e^{2f}-1}{\sin\left(f\right)}\right)$
$2y^2-6y=0$
$\frac{6a^2-b^2}{3}$
$cos^2xsec^2x+cos^2xcsc^2x=csc^2\left(x\right)$
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