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9 August, 20:19

If cosX = 1/5 and angle x is a positive acute angle, find the value of cos (X/2)

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Answers (1)
  1. 9 August, 20:42
    0
    0.7746.

    Step-by-step explanation:

    cos x/2 = √ [ (1 + cos x) / 2]

    = √ (1 + 1/5) / 2

    = √ (6/5) / 2)

    = √ (6/10)

    = 0.7746.

    =
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