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Which of the following set of values of ...

Which of the following set of values of `x` satisfies the equation `2^(2sin^2x-3sinx+1)+2^(2-2sin^2x+3sinx)=9?` (a)`x=npi+-pi/6,n in I` (b) `x=npi+-pi/3, n in I` (c)`x=npi,n in I` (d) `x=2npi+pi/2,n in I`

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