# math

Solve:
tanx - 2sin2x = 0
0°< or equal to x < 360°

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1. x = 0 is one obvious solution.

(sinx/cosx - 2 sin x cosx)= 0
sinx - 2 sinx cos^2x = 0
sinx - 2 sinx(1- sin^2x) = 0
2 sin^2x + sinx = 0
sinx(2 sinx +1) = 0
sinx = 0 or -1/2

x = 0, 180, 210 or 330 degrees

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2. how did you get 210 and 330? =S

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3. nevermind, i understand!

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