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5 May, 10:50

Trigonometry

Angle Sum and Difference, Double Angle and Half Angle Formulas

Find the exact value of:

If sinx = 5/6, find Cos (2x)

+5
Answers (1)
  1. 5 May, 14:34
    0
    -7/18

    Step-by-step explanation:

    cos (2x) = 1 - 2sin²x

    cos (2x) = 1 - 2 (5/6) ²

    = 1 - 2 (25/36)

    = 1 - 25/18

    = - 7/18
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