If ` x/a = y/b = z/c`, then show that `x^(3)/a^(3) + y^(3)/b^(3) + z^(3)/c^(3) = 3 ((x+y+z)/(a+b+

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If ` x/a = y/b = z/c`, then show that `x^(3)/a^(3) + y^(3)/b^(3) + z^(3)/c^(3) = 3 ((x+y+z)/(a+b+c))^(3)`.
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