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Question: 1 does function d defines a metric on r a...

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1. Does function d defines a metric on R? (a) (1 point) d(z, y) - yl2. (b) (1 point) d(e, y)- a -gl. (c) (1 point) d(z, y) tanh(z) - tanh(y)| d(x,v) - y) -
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