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If x=(a+sqrt(a^2+b^3))^(1/3)+(a-sqrt(a^2+b^3))^(1/3) then prove: x^3+3bx=2a

If  x = ( a + √ a 2 + b 3 ) 1 / 3 + ( a − √ a 2 + b 3 ) 1 / 3  prove that  x 3 + 3 b x = 2 a

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