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In a triangle A B C ,\ C D is the bisect...

In a triangle `A B C ,\ C D` is the bisector of the angle `Cdot` If `cosC/2` has the value `1/3` and `l(C D)=6,` then `(1/a+1/b)` has the value equal to `1/9` (b) `1/(12)` (c) `1/6` (d) none

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