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Statement I x =(kpi)/(13), k in I does ...

Statement I ` x =(kpi)/(13), k in I` does not represent the general solution of trigonometric equation.
` sin 13 x - sin 13 x cos 2x=0`
Statement II Both ` x=r pi , r in I and x=(k pi )/(13) , k in I ` satisfies the trigonometric equation.
`sin 13 x - sin 13 x cos 2x =0`

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