The value of $\sqrt{11+2\sqrt{30}}-\frac{1}{\sqrt{11+2\sqrt{30}}}$ is :

The value of $\sqrt{11+2\sqrt{30}}-\frac{1}{\sqrt{11+2\sqrt{30}}}$ is :
1). $2\sqrt{5}$
2). $2\sqrt{6}$
3). $1+\sqrt{6}$
4). $1+\sqrt{5}$

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