The Summing template on the C Key how does it work? - Printable Version +- HP Forums (https://www.hpmuseum.org/forum) +-- Forum: HP Calculators (and very old HP Computers) (/forum-3.html) +--- Forum: HP Prime (/forum-5.html) +--- Thread: The Summing template on the C Key how does it work? (/thread-12954.html) The Summing template on the C Key how does it work? - tom234 - 05-11-2019 11:54 AM [attachment=7229]Product: HP Prime G2 I tried using The Sum that E for lists with i=0 and infinity sign above and the expression after the = sign. I put the template on my Home page and added all the parts it did not work. Does anyone know how to use it I have tried it in CAS and without CAS still, this function does not operate for me. Help needed. https://h30434.www3.hp.com/t5/Calculators/The-Summing-template-on-the-C-Key-how-does-it-work/td-p/7116522 [/quote] RE: The Summing template on the C Key how does it work? - Han - 05-11-2019 01:12 PM The lower-case (script) i is the constant $$\sqrt{-1}$$; use n for your index variable. RE: The Summing template on the C Key how does it work? - DrD - 05-11-2019 01:21 PM 1. (Lower case) i is a reserved variable, 2. The angle mode should be set to radians, 3. Use == for the comparison. RE: The Summing template on the C Key how does it work? - tom234 - 05-11-2019 02:57 PM 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. RE: The Summing template on the C Key how does it work? - JMB - 05-12-2019 08:47 AM It works fine in CAS. RE: The Summing template on the C Key how does it work? - Nigel (UK) - 05-12-2019 10:50 AM (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)