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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`

A

K is rationla number of the form `P/(P+1), P ne -1`

B

K is irrational number whose rational approximation does not exceed 2.

C

K is irrational number

D

K is rational number of the form `P/(P-1), P ne 1`.

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The correct Answer is:
A, C
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