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Question Number 9762 by supungamage001 last updated on 31/Dec/16

$$\mathrm{If}{\cos }^{-1}{x}_1+{\cos }^{-1}{x}_2+...+{\cos }^{-1}{x}_n=n\pi ,$$$$\mathrm{then}{x}_1+x_2^2+x_3^3+...+x_n^n=$$

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