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Solve for x: cos^-1x + cos^-1x^2 = 2π

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Solve for x: cos-1x + cos-1x2 = 2π

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Given, cos-1x cos-1x2 = 2π

It is possible only when

cos-1x = π and cos-1x2 = π

x = cosπ = - 1 and x2 = - 1 and x2 =  - 1

Thus, no such value of x is exist.

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