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If e^(cos x)-e^(-cos x) =4, then the val...

If `e^(cos x)-e^(-cos x) =4`, then the value of the `cosx` is

A

`log(2+sqrt5)`

B

`-log(2+sqrt5)`

C

`log(-2+sqrt5)`

D

none of these

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The correct Answer is:
D
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PATHFINDER-QUADRATIC EQUATION AND EXPRESSION-QUESTION BANK
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