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Given A, B, C represents angles of a ΔAB and cosA + 2 cosB + cosC = 2 and AB = 3 and BC = 7 then cosA – cosC is

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Given A, B, C represents angles of a ΔAB and cosA + 2 cosB + cosC = 2 and AB = 3 and BC = 7 then cosA – cosC is

(1) -10/7 

(2) 10/7 

(3) 5/7 

(4) -5/7

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Correct option is (1) -10/7

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