My assigment is learn how to input the function in maple and then plot it.

tThis is how it was presented"Enter the function f(N,x)=summation{[(-1)^(n=1)]/n]}* sin(nx). this function is a series with inputs,N the numbers of terms in the summation, as well as the independent variable,x. Display the Maple output off(N,x0 as a function of x for values N=1,3,5 and N= infinity. This funtion is a summation of N sine waves with periods2pi/1,2pi/2,2pi/3,...2pi/N. Each of its sine wave has an amplitude 1/n if n is an odd positive #, and -1/n if n is an even#,where n=1,2,...,N".  Hope this makes it clearer. So I guess I am looking for the sintax to enter this in Maple.