If cos^2x+cos^2 2x+cos^2 3x=1 then (a) x...

If `cos^2x+cos^2 2x+cos^2 3x=1` then (a) `x=(2n+1)pi/4,\ n in I` (b) `x=(2n+1)pi/2,\ n in I` (c) `x=npi+-\ pi/6,\ n in I` (d) none of these

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