If A+B=pi/3a n d\ cos A+cos B=1,\ t h e ...

If `A+B=pi/3a n d\ cos A+cos B=1,\ t h e n-` a.`cos(A-B)=1//3` b. `\ |cos A-cos B|\ =sqrt(2/3)` c.`cos(A-B)=\ -1/3` d. `\ |cos A-cos B|=1/(2sqrt(3))`

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