$\lim_{x\to0}\left(\frac{\sin\left(x\right)}{e^x-1}\right)$
$y^2-16y+64$
$\left(-\sqrt{3}a+b\right)^2$
$\frac{4s^{-5}}{7s^3}$
$-2x^2-3x+4$
$\lim_{x\to-4}\frac{x^2+25}{x+4}$
$\frac{sinb}{1-cosb}=\frac{1+cosb}{sinb}$
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