Q. 485.0( 1 Vote )

Answer each of the following questions in one word or one sentence or as per exact requirement of the question:

Write the value of .

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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