The Summing template on the C Key how does it work?

[Nigel (UK)]

(05-11-2019 02:57 PM)tom234 Wrote:  Thank you I have done the following, however, the answer is 1.9 It should be
1.5 for pi/2 and the answer should be 1.

I can't do this in a function app. I had to do it in just the regular window under CAS.
Is that where I should be entering it.

The problem with what is shown in your thumbnail is that the \((2n+1)!\) in the denominator is outside the summation, which is why it still appears in the final answer.

Nigel (UK)