Question: For xe R' and ye R', define di(x, y) = (x -y)?, d2 (x, y) = VIx- yl, da(x, y) = 1x2 - y21, da(x,

For xe R' and ye R', define di(x, y) = (x -y)?, d2 (x, y) = VIx- yl, da(x, y) = 1x2 - y21, da(x, y) = 1x - 2yl, ds(x, y) = | x- yl Determine, for each of these, whether it is a metric or not

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