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In a triangle ABC , if cos A +2 cos B +...

In a triangle ABC , if ` cos A +2 cos B + cos C=2 and the lengths of the sides opposite to the angles A and C are 3 and 7 respectively , then cos A - cos C is equal to

A

`3/7`

B

`9/7`

C

`(10)/7`

D

`5/7`

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