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Find |x|+|y| and |x+y| and find the rela...

Find `|x|+|y|` and `|x+y|` and find the relation between them in each of the following cases..
a) `x=4, y=3`
b) `x=4, y=-3`
c) If `|x|=x` and `|y|=-y`, what is the relation between `|x|+|y|` and `|x+y| ?

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