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Homework Statement
1)If either |z|=1 or |w|=1,prove that
[tex]|\frac{z-w}{1-\overline{z}w}|=1[/tex]
2)If z1,2,3, are complex numbers and
[tex]\frac{z_2 - z_1}{z_3 -z_1}=\frac{z_1 -z_3}{z_2-z_3}[/tex]
Show that |z2-z1|=|z3-z1|=|z2-z_3|
3) Find the sum of the following series:
nC1sinx + nC2 sin2x + nC3 sin3x +...+ nCn sin(nx)
Homework Equations
[tex]|\frac{Z_2}{Z_1}|=\frac{|Z_2|}{|Z_1|}[/tex]
The Attempt at a Solution
(Will type in the next post since, the site is giving trouble for me at the moment)