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If cos2x-3cosx+1=(cos e c\ x)/(cotx-cot2...

If `cos2x-3cosx+1=(cos e c\ x)/(cotx-cot2x),\ ` then which of the following is true ? `x=(2n+1)\ pi/2,\ n\ in I` (b) `x=2npi,\ n in I` `x=2npi+-cos^(-1)(2/5),\ n in I` (d) no real `x`

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