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3 May, 21:09

Sin (11∘) cos (19∘) + cos (11∘) sin (19∘)

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  1. 3 May, 21:37
    0
    Recall that:

    sin (A + B) = sinAcosB + cosAsinB

    Therefore:

    sin11°cos19° + cos11°sin19° = sin (11° + 19°)

    = sin30° = 0.5

    I hope this explains it.
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