Find all reals numbers a , b solutions for equation :
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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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