Question

-1
Q.5 Find the principal value of cos-1(-1/2)​

Answer 1

Answer:

2π/3

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Step-by-step explanation:

Let y = cos-¹ (-1/2)

cos y = -1/2

cos y = cos (2 pi/3)

or

cos−1(−1/2) = π − cos−1(1/2)

                         = π − π/3 = 2π/3

range of principle values of cos ‐¹ is ( 0, π)

hence the principle value is :2π/3

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