Math miscellaneousHard
Question
In a parallelogram ABC, 
= a, 
= b and 
= c, then 
. 
has the value :
= a, = b and = c, then . has the value :Options
A.1/2 (a2 + b2 + c2)
B.1/2 (a2 − b2 + c2)
C.1/4 (a2 + b2 − c2)
D.1/3 (b2 + c2 − a2)
Solution
, 
, 
∵
⇒ a2 + b2 + 2
= C2⇒ a2 + b2 + 2a2 + 2
⇒ 3a2 + b2 - c2 = + 2
⇒
= 
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