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March 30, 2017

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prove or disprove cos(x-y)=cos(x)-cos(y)

  • pre-calc - ,

    try x = y = 45 degrees

    cos (45 - 45) = cos 45 - cos 45

    cos 0 = 1/sqrt2 - 1/sqrt 2

    1 = 0 no way :)

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