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In `Delta ABC` of a :b:c= 7 : 8: 9 .Then cos A : cos B is equal to :-

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in Binomial Theorem by (75.1k points)
In `Delta ABC` of a :b:c= 7 : 8: 9 .Then cos A : cos B is equal to :-
A. `11/63`
B. `22/63`
C. `2/9`
D. `14/11`
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Correct Answer - D
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