On solving \[\left( x-y \right)\left( x+y \right)+\left( y-z \right)\left( y+z \right)+\left( z-x \right)\left( z+x \right)\]

On solving \[\left( x-y \right)\left( x+y \right)+\left( y-z \right)\l

1.	On solving \[\left( x-y \right)\left( x+y \right)+\left( y-z \right)\left( y+z \right)+\left( z-x \right)\left( z+x \right)\]
A.	\[0\]
B.	\[1\]
C.	\[-1\]
D.	\[2\]
Answer» B. \[1\]

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On solving \[\left( x-y \right)\left( x+y \right)+\left( y-z \right)\left( y+z \right)+\left( z-x \right)\left( z+x \right)\]

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