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If the equation cosx + 3cos(2Kx) = 4 has...

If the equation `cosx + 3cos(2Kx) = 4` has exactly one solution, then (1)K is a rational number of the form` P/(P+1)`,`P!=-1`(2) K is irrational number whose rational approximation does not exceed 2 (3) K is irrational number (4) K is a rational number of the form `P/(P-1)``P!=1`

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