$\frac{1}{2x-4}-1$
$-159-89$
$\lim_{x\to\pi}\left(\frac{1+\cos\left(2\right)x}{1-\sin\left(x\right)}\right)$
$\left(6x^3+3\right)^3$
$\left(\frac{2}{3}x+2y\right)\left(\frac{2}{3}x-2y\right)$
$\cos^2b\left(2+\tan^2a\right)$
$y2+16+64$
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