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17 April, 12:39

What is the principal value cost of cos -1

(0.69)

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Answers (1)
  1. 17 April, 15:32
    0
    We are asked to find the principal value of

    cos ⁻¹ (0.69)

    which is just the least positive angle

    cos ⁻¹ (0.69) = 46.37°

    Other values of

    cos ⁻¹ (0.69) is

    46.37° - 180° n

    where n is a whole number
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