If x = b+c -2a, y=c+a-2b, z=a+b-2c, then the value of x2+y2-z2+2xy is :
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Q:
If x = b+c -2a, y=c+a-2b, z=a+b-2c, then the value of x2+y2-z2+2xy is :
- 1a-b+cfalse
- 2a+b-cfalse
- 30true
- 4a+b+cfalse
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