JEE Main 11 April 2015 Paper

Section: Mathematics

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Question : 85 of 90

Marks: +1, -0

In a parallelogram ABCD, |

→

AB

|=a,|A

→

D

|=b and |A

→

C

|=c,then D

→

B

.A

→

D

has the value:

[Main 11 Apr 2015]

1
2
(a2−b2+c2)
1
4
(a2+b2−c2)
1
3
(b2+c2−a2)
1
2
(a2+b2+c2)
None of the above

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