"If z=cis(ø), find the argument and modulus of 1-z"
Follow Math Help Forum on Facebook and Google+
Originally Posted by karldiesen "If z=cis(ø), find the argument and modulus of 1-z" Let's say that $\displaystyle \phi \ne 0$. Then because $\displaystyle 1-\cos(\phi)>0$ implies $\displaystyle \arg(1-z)=\arctan\left(\frac{\sin(-\phi)}{1-\cos(\phi)}\right)$.
Originally Posted by karldiesen "If z=cis(ø), find the argument and modulus of 1-z" Do you know what "cis" means? If so you can write z in the form "a+ bi", subtract from 1 and then find the argument and modulus of that.
View Tag Cloud