MHTCET 13 May 2023 Shift 2 Solved Paper

Section: Mathematics
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Question : 73 of 150
 
Marks: +1, -0
In △ABC, with usual notations, if ‌
b+c
11
=‌
c+a
12
=‌
a+b
13
, then the value of cos‌A+cos‌B+cos‌C is
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