Find the value of cos-1(cos(7π/6)). – InterviewSolution

1.

Find the value of cos-1(cos(7π/6)).

Answer»

cos^-1(cos(7π/6)) = cos^-1(cos(2π - 5π/6)) where, 5π/6 ∈ [0, π]

∴ cos^-1(cos(7π/6)) = cos^-1(cos(5π/6)) = 5π/6 (∵ cos(2π - θ) = cosθ)

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