Should it be 0? Since if x = 0 it is at 0? THANK YOU!!!
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[quote=miss.strw;378426] Should it be 0? Since if x = 0 it is at 0? THANK YOU!!! Evaluate the limit when x --> 0 of [f(x) - f(0)]/x , which is: x^2*sin(1/x)/x = x*sin(1/x) --> 0 since sin(1/x) is bounded. So f'(0) = 0 Tonio
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