1.

(x+y)2 + (y+z)2 =

A. X2+y2+z2+2xy+4yz
B. X2+y2+z2+4xy+2yz
C. X2+2y2+z2+2y(x+z)
D. X2+2y2+z2+2x(y+z)
Answer» D. X2+2y2+z2+2x(y+z)


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