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In Delta ABC if a: b: c = 3 : 5: 7 , t...

In `Delta ABC ` if a: b: c = 3 : 5: 7 , then , cos A + cos B =

A

`(13)/(7)`

B

`(11)/(7)`

C

`(12)/(7)`

D

`(10)/(7)`

Text Solution

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The correct Answer is:
C
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