Question: Trigonometric Series

The deflection curve of a prismatic bar can be represented by a trigonometric series (S. Timoshenko, Theory of Elastic Stability, 1st Ed. 1936, p. 23). I am trying to find a way to enter a sine series into Maple of the form: y=a1*sin(Pi*x/l)+a2*sin(2*Pi*x/l)+a3*sin(3*Pi*x/l)+... I have downloaded the FourierTrigSeries package and have not had any success in entering the sine series as defined above. Any suggestions? Thank you for your assistance.
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