1.

Let alpha and betabe any two positive values of x for which2 cos x, |cos x| ,and 1 -3 cos ^(2) xare in G.P. The minimum value of |alpha - beta | is

Answer»

`(PI)/( 3)`
`(pi)/( 4)`
` (pi)/( 2)`
` (pi)/(2)`

ANSWER :D


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