SOLUTION: Using a Double-Angle Formula we see that the equation sin x + sin 2x = 0 is equivalent to the equation__________, Factoring we see that solving this equation is equivalent to solvi
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Question 969011: Using a Double-Angle Formula we see that the equation sin x + sin 2x = 0 is equivalent to the equation__________, Factoring we see that solving this equation is equivalent to solving the two basic equations sin x = 0 and_____.
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
for interval [0, π]
sin x + sin 2x = 0
sinx+2sinxcosx=0
sinx(1+2cosx)=0
sinx=0
x=0
or
1+2cosx=0
2 cosx=-1
cosx=-1/2
x=2π/3
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