Let us assume that, y = cos-1( -1/2)
We can write this as:
cos y =- 1/2
cos y = cos (2π/3).
Thus, the Range of the principal value of cos-1 is [0, π ].
Therefore, the principal value of cos-1( -1/2) is 2π /3.
Let us assume that, y = cos-1( -1/2)
We can write this as:
cos y =- 1/2
cos y = cos (2π/3).
Thus, the Range of the principal value of cos-1 is [0, π ].
Therefore, the principal value of cos-1( -1/2) is 2π /3.
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BOOK
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