Question

subtracting xsquare - ysquare + zsquare from xsquare - ysquare - zsquare the resulant expession is ------- (2xysquare,2ysquare,-2zsquare,0)

Answer 1

Ans:- x²-y²-z² - (x²-y²+z²)

= x² - y² - z² - x² + y² - z²

= -2z²

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