Consider the following function with two real variables on its definition set .

Question

Consider the following function with two real variables    on its definition set   .

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.

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is not continuous at   .

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the limit of    as    tends to    is   .

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cannot be extended by continuity at   .

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can be extended by continuity at   .

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the limit of    as    tends to    is -1.

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the limit of    as    tends to    is 0.

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the limit of    as    tends to    is1.

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