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[qquad [qquad ((x-4)/(|x-4|)+a,quad x<4]...

[qquad [qquad ((x-4)/(|x-4|)+a,quad x<4],[quad a+b,,x=4." Then "f(x)" is continous "],[qquad x-4,x=4." Then "f(x)" is continous "],[(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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