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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 :

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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`
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1 Answer

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Correct Answer - 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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