What is the value of$ Cot 60^{0} - Cos 45^{0}$?

What is the value of$ Cot 60^{0} - Cos 45^{0}$?
1). $\frac{\left(9 -2 \sqrt{3}\right)}{9}$
2). $\frac{\left(2\sqrt{6}-1\right)}{\sqrt{3}}$
3). $\frac{(1 -2 \sqrt{3})}{2}$
4). $\frac{\left(\sqrt{2}-\sqrt{3}\right)}{\sqrt{6}}$

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