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$\frac{sin 3x}{cos 3x} = tan \ 3x = 1$
3x = 45o, 225o, 405o, 585o, 765o, 945o
x = 15o, 75o, 135o, 195o, 255o, 315o
raphael answered the question on January 16, 2017 at 07:24
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