Find the value of cos-1(cos \(\frac{13\pi}6\)). – InterviewSolution

1.

Find the value of cos-1(cos \(\frac{13\pi}6\)).

Answer»

Given cos^-1 (cos 13π/6)

= cos^-1 [cos (2π + π/6)]

= cos^-1 (cos π/6)

= π/6

∴ cos^-1 (cos 13π/6) = π/6

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