Question: Incomprehensible behavior

The plot in the attached file only works if the complete function expression is entered. If only the function name is entered, no plot appears. What am I doing wrong?test.mw

restart;

c(x)dsum(sin(10^k*x)/10^k, k = 1 .. 10^2)

plot(c(x), x = -(1/4)*Pi .. (1/4)*Pi)

 

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c(x)dsum(sin(10^k*x)/10^k, k = 1 .. 10^2)

plot(sum(sin(10^k*x)/10^k, k = 1 .. 10^2), x = -(1/4)*Pi .. (1/4)*Pi)

 

 

NULL

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