Show that 1+2+z+...+ 2n = and deduce that 1-n+1 1-z 1 + cos 0 + cos...
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Show that 1+2+z+...+ 2n = and deduce that 1-n+1 1-z 1 + cos 0 + cos 20 + + cos no - 1 2 for any complex number z except z = 1, sin[(n + 1)0] 2 sin (2) + 3 0 < 0 < 2T. Show that 1+2+z+...+ 2n = and deduce that 1-n+1 1-z 1 + cos 0 + cos 20 + + cos no - 1 2 for any complex number z except z = 1, sin[(n + 1)0] 2 sin (2) + 3 0 < 0 < 2T.
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