Answer
a) $0$
b) $0$
c) $0$
d) $0$
Work Step by Step
The function is continuous at the point $ x = 0 $ and thus,
$ \lim\limits_{x \to 0^-} G(x) = \lim\limits_{x \to 0^+} G(x) = \lim\limits_{x \to 0} G(x) = G(0) = 0 $
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