MaplePrimes - answers and comments on Question, sum with trigonometric coefficients

You have got (-1) raised to the half odd

lzhao — Mon, 28 Jan 2013 17:38:26 Z

You have got (-1) raised to the half odd integer powers in the sum, so the terms with I in front are inevitable. If you do not like those terms, change your sum or collect only the real terms to make the plot.

Possible variant

Kitonum — Tue, 29 Jan 2013 13:18:44 Z

Numbers (-1) ^ (1/2 ) , (-1) ^ (3/2) and so on - are some complex numbers. If you want them to have remained in that state, and not calculated to form a+I*b (I - complex unit), you can write like this

sum(-y2*y3+8*(-1)^``((k-1)*(1/2))*sinh(y2*Pi*k)*sin(k*Pi*y3)/(Pi^3*k^3*cosh((1/2)*k*Pi)), k = 1 .. 10);

thank you

SamuelTuvare — Tue, 29 Jan 2013 13:50:56 Z

thank you