Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$\sqrt{ 2+ \frac{ \sqrt{ 5 } }{ 2 } } - \sqrt{ 2- \frac{ \sqrt{ 5 } }{ 2 } }$$

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