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Z y2. X^2+Y^2=Z^2. Z X 2 Y 2 график. X^2-Y^2-Z=0 график. X 2 Y 2 Z 2 1 график.
X^2+Y^2=Z^2. Z X 2 Y 2 график. X^2-Y^2-Z=0 график. X 2 Y 2 Z 2 1 график.

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