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[" 10.Let "f(x)={[(x-4)/(|x-4|)+a,,x<4],...

[" 10.Let "f(x)={[(x-4)/(|x-4|)+a,,x<4],[a+b,,x=4." Then,"f(x)" is continuous at "x=4" when "],[(x-4)/(|x-4|)+b,,x>4]],[[" (a) "a=0,b=0," (b) "a=1,b=1," (c) "a=-1,b=1," (d) "a=1,b=-1]]

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