Write the value of cos-1(cos \(\frac{14\pi}3\)). – InterviewSolution

1.

Write the value of cos-1(cos \(\frac{14\pi}3\)).

Answer»

Given cos^-1 (cos 14π/3)

= cos^-1 [cos (4π + 2π/3)]

= cos^-1 (cos 2π/3)

= 2π/3

∴ cos^-1 (cos 14π/3) = 2π/3

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