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14 August, 13:21

Sin (x+20) - cos (2X+10)

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  1. 14 August, 13:39
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    X=20

    Step-by-step explanation:

    Sin (x+20) = cos (2x+10)

    Sin (x+20) = sin (90 - (2x+10)

    X+20=90-2x-10

    3x=60

    X=20
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