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Find the principal values of cos^-1(cos(7π/6)).

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Find the principal values of cos-1(cos(7π/6)).

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cos-1(cos(7π/6)) = cos-1(cos(π + π/6))

= cos-1(-cosπ/6) = cos-1(-√3/2) = π - π/6 = 5π/6

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