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In triangle ABC, if (b+c)/9=(c+a)/10=(...

In triangle ABC, if
`(b+c)/9=(c+a)/10=(a+b)/11,then (cosA+cosB)/cosC=`

A

`9/10`

B

`10/11`

C

`11/12`

D

`12/13`

Text Solution

Verified by Experts

The correct Answer is:
C
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