KEAM 2013 Math Paper

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Question : 49 of 120
 
Marks: +1, -0
If ab>−1,bc>−1 and ca>−1, then the value of
cot−1(
ab+1
a−b
)
+cot−1(
bc+1
b−c
)
+cot−1(
ca+1
c−a
)
is equal to
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