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Select and write the correct answer from the alternatives in each of the following :
The principal solution of `cos^(-1)(-1/2)` is :

A

`pi/3`

B

`pi/6`

C

`(2pi)/3`

D

`(3pi)/2`

Text Solution

Verified by Experts

The correct Answer is:
C
`cos^(-1) (-1/2) = cos^(-1)[cos(pi - pi/3)] = pi - pi/3 = (2pi)/3`
Hence, the correct answer from the given alternative is (c ).
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