symbolic math sum over n of cos(nx) yields closed form solution. Sum over n of sin(nx) gives complex result. ??Help

[rpond-2]

[MJG]

How about this?  I'm not sure why Mathcad can't make the simplification on its own.

[rpond-2]

Thanks! I tried expand but it seemed like I was going the wrong way. I gave up too soon. Who would have thunk it.

[AlanStevens]

Try using the keyword "rectangular".

Alan

[rpond-2]

Thanks AS good input

[MJG]

Thanks, Alan.  You taught me something new today - this is why I frequent this site.

[MJG]

Yes, expanding is "going the wrong way," but sometimes you can get lucky by expanding and then simplifying a portion of the expansion as I did here.

[-MFra-]