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-   -   Prove sin x-sin 7x / 2 sin^2 2x-1 = 2 sin 3x (https://www.askmehelpdesk.com/showthread.php?t=642520)

  • Mar 10, 2012, 08:29 PM
    ryzareonal
    Prove sin x-sin 7x / 2 sin^2 2x-1 = 2 sin 3x
    I need to answer this

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