Solve Sinx+sin3x+sin5x=0
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sin x+sin 3x+ sin 5x=0
sin 3x+ sin x+sin 5x=0
sin 3x+ sin 3x cos 2x=0
------------------->(((sin x+sin y= sin x+y/2
cos x-y/2)))
sin 3x(1+cos 2x)=0
sin 3x =0
3x=nπ
x=nπ/3
1+cos 2x=0
cos 2x=-1
cos x =-1/2
(2nπ±y)
x= 2nπ±π/6
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