Originally Posted by

**Ian1779** Hi

I am having some problems trying to answer part of this question

I have attached file as I don't quite know how to upload the image... yet

I have done the first part and calculated the F(t)

I understand what happens to the series when you input t=0 as it that means cos 0 = 1 and sin 0 = 0.

Same again with the third part - the best value i think to use is t=pi as cos pi = -1 and sin pi = 0.

What i'm stuck on is how I apply this to evaluate the series.

Please help!!

Thanks