$\lim_{x\to5}\left(\frac{3x}{\left(x^2-x-20\right)\cos\left(x-6\right)}\right)$
$9x^2+2\left(x^2-1\right)$
$\left(2s+3r\right)\left(2s-3r\right)$
$0=e^{2x-y}\cdot dx+e^{y-2x}\cdot dy$
$w^2-10w=-7$
$x^2+3x+6=0$
$\left(8x^2+6x+1\right)$
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