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17 January, 13:59

If sin 2X = COS ZY and m2X = 72°, what is the measure of ZY?

18°

072°

90°

108°

+2
Answers (2)
  1. 17 January, 14:33
    0
    The answer would be 18'
  2. 17 January, 15:32
    0
    18°

    Step-by-step explanation:

    sin 2x=cos zy

    m (2x) = 72°

    cos (π/2-a) = sin a

    cos (π/2-72°) = sin72°

    cos18°=sin72°

    =>m (zy) = 18°
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