KCET 2016 Math Solved Paper

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Question : 39 of 60
 
Marks: +1, -0
Suppose
→
a
+
→
b
+
→
c
=0
, |
→
a
|
=3
,
|
→
b
|=5
, |
→
c
|
=7
, then the angle between
→
a
&
→
b
is
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