Prove that 1+sin(x)-cos(x) = 2sin(x/2)cos(x/2)+sin(x/2) I have not managed to establish how sin(x/2) relates to cos(x) 10/23/2013 | Wisdom from New York, NY | 2 Answers | 0 Votes
If the common ratio of a GP with a sum to infinity is x^2-x-1, within what limits must lie? I feel we have two unknown values here, either the first term or sum to infinity should have been given. I think so! Help 10/23/2013 | Wisdom from New York, NY | 1 Answer | 0 Votes