$\sin\left(a\right)=0$
$\lim_{x\to4}\left(\frac{\sqrt{x}-\sqrt{2}}{x-2}\right)$
$\frac{1}{\sqrt{4x-3-x^2}}$
$\lim_{x\to2.1}\:\left(x^2-3x+1\right)$
$\lim_{x\to3}\left(\frac{x^2+9}{x-3}\right)$
$\left(9z^4+3z^2-1\right)\left(3z^2-1\right)$
$a+4b-5a-a$
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