SOLUTION: Polar representation of z= cos a-isina Where 0<a<2&#960;

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Question 984931: Polar representation of z= cos a-isina
Where 0
Answer by ikleyn(53763) About Me  (Show Source):
You can put this solution on YOUR website!

z = cos(a) -i*sin(a)  =  cos(-a) + i*sin(-a).

The modulus is  1.
The argument  (the polar angle)  is  -a.