\( e^{\cos x}-e^{-\cos x}=4 \), then the value of \( \cos x \)
(A) \( \log _{e}(2+\sqrt{5}) \)
(...
\( e^{\cos x}-e^{-\cos x}=4 \), then the value of \( \cos x \)
(A) \( \log _{e}(2+\sqrt{5}) \)
(B) \( -\log _{i}(2+\sqrt{5}) \)
(C) \( \log _{e}(-2+\sqrt{5}) \)
(D) none of these
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