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If tan alpha = 1/sqrt(x(x^2+x+1)),tan b...

If `tan alpha = 1/sqrt(x(x^2+x+1)),tan beta=sqrtx/sqrt(x^2+x+1)` and `tan gamma=sqrt(1/x^3+1/x^2+1/x)` be such that `lalpha+mbeta+ngamma=0` then the value of `l^3+m^3+n^3-3lmn` is

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