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Math Help - Trigo-equation

  1. #1
    Super Member dhiab's Avatar
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    Trigo-equation

    Find all reals numbers a , b solutions for equation :

    \sin (3a + b) + \sin (3a - b) + \sin (a - b) - \sin (a + b) = \cos (b)
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  2. #2
    Senior Member pacman's Avatar
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    Jul 2009
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    is not this the right form? sin (3A + B) + sin (3A - B) - sin (A - B) - sin (A + B) = cos B,

    4 sin A cos 2A = 1,

    plot of 4 sin A cos 2A - 1 = 0,

    6 roots i think . . . .

    why do angle B vanishes in my equation?
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