If n be any positive integer, prove that cosnθ−cosnα=2n−1[cosθ−cosα][cosθ−cos(α+2πn)]⋯[cosθ−cos(α+(n−1)2πn)]
I am struggling to establish this result. I have tried induction, but it doesn't help. Could I have a hint?
How to find limh→0sin(ha)h without lhopital rule? I know when I use lhopital I easy get $$ \lim_{h\rightarrow 0}...
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