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Z x2. Конус x^2+y^2=z^2. X^2+Y^2=Z^2. X^2+Y^2-Z^2=0. Z X 2 Y 2 график.
Конус x^2+y^2=z^2. X^2+Y^2=Z^2. X^2+Y^2-Z^2=0. Z X 2 Y 2 график.

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