$\lim_{x\to1}\left(\frac{log\left(x\right)}{\frac{1}{log\left(x-1\right)}}\right)$
$\frac{d}{dx}\left(\:5x^2+3y-x=2\right)$
$b-4=12$
$\frac{x^2-14x+48}{x-8}$
$121+198\cos^6x+81\cos^{12}x$
$2x^2-6y^2$
$-42x+4x^2+108$
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