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Consider biquadratic equation 81x^(4) + ...

Consider biquadratic equation `81x^(4) + 216x^(3) + 96x = 65`, whose roots are `a,b,c,d`. Given `a,b`, real roots and `c,d` are imaginary roots.
On the basis of above information, answer the followin questions:
The Value of `c^(3) + d^(3) - (a+b))^(3)` is equal to

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