AP EAMCET Engineering 2018 Apr 22 Shift 2 Paper

Section: Mathematics
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Question : 27 of 160
 
Marks: +1, -0
In triangle ABC, if a=3,b=4,c=6, then
cot‌
A
2
+cot‌
B
2
+cot‌
C
2
cot‌A+cot‌B+cot‌C
=
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