題組內容
4. (15%) Let f(x) = x2 sin 
for x ≠0 and f(0) = 0.
(a) Use 
definition to show that f is continuous at x = 0.
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4. (15%) Let f(x) = x2 sin for x ≠0 and f(0) = 0.
(a) Use definition to show that f is continuous at x = 0.