4. Simplify :(x+y+z)2 + (x+y-Z )2
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( x+y+z)² + (x+y-z)² = x² + y² + z² + 2xy + 2yz + 2xz + x² + y² + z² + 2xy - 2yz - 2xz
= 2x² + 2y² + 2z² + 4xy.
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