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Use a half angle formula to determine the exact value of sin 7(pi)/12.

  • Math -

    well, 7 pi/6 is 180 + 30 degrees
    and 7 pi/6 = twice 7 pi/12

    we know sin and cos of 7 pi/6
    sin 7 pi/6 = -1/2
    cos 7 pi/6 = -(1/2)sqrt3
    so now you should be able to find the sin of 7 pi/12

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