Suppose f and g be two real functions continuous at a real number c.Th

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Suppose f and g be two real functions continuous at a real number c.
Then
(1) f g is continuous at x=c
(2) f-g is continuous at x=c
(3) f*g is continuous at x=c
(4) [f/g] is continuous at x=c, (provided g(c)=!0