Example

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

Question

$$\sqrt{ (9+4 \sqrt{ 5)(9-4 \sqrt{ 5) } } }$$

Evaluate

$\sqrt{36\sqrt{5}-71}\approx 3.081955092$

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