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If (x+y)^(2)=2(x^(2)+y^(2))and(x-y+lamda...

If `(x+y)^(2)=2(x^(2)+y^(2))and(x-y+lamda)^(2)=4,lamdagt0,` then `lamda` is equal to :

A

1

B

2

C

3

D

4

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