$36k^2-1$
$\frac{1-\cos\left(0\right)}{\sin^2\left(0\right)}$
$9x+21y\:$
$\lim_{x\to0}\left(x^4-e^{-x^3}\right)$
$\frac{x^2-36}{x^2+3x-18}$
$\frac{\left(3x\right)}{\sqrt{7x+4}}$
$x^{3\sqrt{5}}\cdot x^{4\sqrt{5}}$
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