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2° -> √(2*5) + √(2*4*5) - √(2*5*9) = √(2*5) + 2√(2*5) - 3√(2*5) = 0
3° -> {√(2*3*3) - √(2*2*2*2*2) } / √2 = (3√2 - 4√2) / √2 = -√2 / √2 = -1
4° -> {√(2*2*5) - √(2*5*9)} / √5 = {2√5 - 3√(2*5) } / √5