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जी1. ८08 | ०० 2276

Answer»

Principal value branch of Cos^-1 is [ 0 , π]

We know that , Cos ( 2π + θ)= cosθ

Cos^-1 ( Cos13π/6) = Cos^-1[ Cos ( 2π + π/6 ) ]

Cos^-1 ( Cos π/6 )

=π/6



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