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solve sin(2x)+sin(x)=0?...

solve `sin(2x)+sin(x)=0?`

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`sin^2x+1/4sin^2 2x=sinxsin^2 3x`
`sin^2x-sinxsin^2 3x+1/4sin^2 3x=0`
`(sinx-1/2sin^2 3x)^2-1/4sin^4 3x+1/4sin^2 3x=0`
`(sinx-1/2sin^2 3x)^2+1/4sin^2 3x[-sin^2 3x+1]=0`
`(sinx-1/2sin^2 3x)^2+1/4sin^2 3xcos^2 3x=0`
`(sinx-1/2sin^2 3x)^2+1/4*(sin^2 6x)/4=0`
`(sinx-1/2sin^2 3x)^2+1/16sin^2 6x=0`
`(sinx-1/2sin^2 3x)^2+(1/4sin6x)^2=0`
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CENGAGE PUBLICATION-TRIGONOMETRIC FUNCTIONS-All Questions
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