Solev the following:If tanalpha=frac(1)(...

Solev the following:If `tanalpha=frac(1)(sqrt(x(x^2+x+1))),tanbeta=frac(sqrtx)(sqrt(x^2+x+1))` and `tanr=sqrt(x^-3+x^-2+x^-1)`then show that`alpha+beta=r`

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