Simplify :(x+y+z)^2 + (x+y-z )^2?
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Sol.) (x+y+z)² + (x+y-z)²
= x² + y² + z² + x² + y² - z²
= x² + x² + y² + y² + z² - z²
= x⁴ + y⁴ (ANSWER)