i'm going through this question. firstly how would the graph look like? at first i thought it would be http://i.imgur.com/XfVCK.png the top graph drawn, but then i thought maybe it's the bottom one. if it was the bottom one then it'd be easier for me to do the question, since it'd be an odd function, and i dont quite understand how i can substitute a value into the x for that f(x + 2pi) = f(x) line and from that, draw the -f(x) component, though i believe that means that the function repeats itself every 2pi interval? so is it the top graph or the bottom graph? i think it's top, since it'd have to repeat itself every 2pi. i'll continue the question and post up my working out so someone can validate if i'm doing it right (thanks).