[" 44.If "e^(cos x)-e^(-cos x)=4" ,then ...

[" 44.If "e^(cos x)-e^(-cos x)=4" ,then the value of "cos x" is "[WB-07]],[" (A) "log(2+sqrt(5))(B)-log(2+sqrt(5))(C)log(-2+sqrt(5))(D)None]

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