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9 June, 07:00

If sin 30º = cos (2x), then x=

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Answers (2)
  1. 9 June, 07:07
    0
    sin 30 = cos 2x

    cos60 = cos 2x (sin (90 - 60) = cos60)

    2x = 60

    x = 30
  2. 9 June, 07:22
    0
    30°

    Step-by-step explanation:

    sin 30º = cos (2x)

    sin 30º = cos (90°-30°)

    ⇒2x=60° ⇒ x=30°
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