$2\cos^2x-4\cos x-3$
$4a^2-16b^2$
$\sqrt{x+\sqrt{x+8}}=2\sqrt{x}$
$1-b\left(1-b\right)$
$m^2-5m+25$
$\frac{1-\cos\left(a\right)}{1+\cos\left(a\right)}$
$\lim_{x\to\infty}\left(\frac{-3x^5-1}{x^4+9}\right)$
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