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25 June, 17:51

Write cos (19°) in terms of sine

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  1. 25 June, 21:23
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    sin (71°)

    Step-by-step explanation:

    Sine lags behind cosine by 90°

    In other word, cos (∅) = sin (90° - ∅)

    cos (19°) = sin (90° - 19°)

    = sin (71°)
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