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Find the exact solutions of the equation in the interval [0, 2π).

 

sin 2x + sin x = 0

 Nov 27, 2018
 #1
avatar+16286 
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sin 2x + sin x = 0

2 sin cos + sin = 0

sin(2cos +1) = 0         so sin = 0  (at 0  pi  2 pi)   or   cos = -1/2  ( at 2pi/3   4pi/3  )

 Nov 27, 2018

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