3+cos2x+cos4x+cos6x-4cosx*cos2x*cos3x

3+cos2x+cos4x+cos6x-4cosx*cos2x*cos3x
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2 Answers

 

3+cos2x+cos4x+cos6x-4cosx*cos2x*cos3x

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2cos6x-3cos4x+5=0
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