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11 February, 16:48

If cos 3 A = sin (A-22), find A

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  1. 11 February, 18:02
    0
    A = 28

    Step-by-step explanation:

    Using the cofunction identity

    cos x° = sin (90 - x) °

    with x = 3A, then

    90 - 3A = A - 22 (add 3A to both sides)

    90 = 4A - 22 (add 22 to both sides)

    112 = 4A (divide both sides by 4)

    A = 28
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