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 March 2nd, 2014, 08:06 PM #1 Senior Member   Joined: Jan 2014 Posts: 196 Thanks: 3 De Moivre's formula apply here? I want to make sure I am applying De Moivre's formula correctly... $(8cis40^{\circ})^3$ so if $z=2cis40^{\circ}$, then $z^3=8cis120^{\circ}$?? Thanks for any help!
 March 2nd, 2014, 08:09 PM #2 Senior Member   Joined: Jan 2014 Posts: 196 Thanks: 3 Re: De Moivre's formula apply here? OOOOOpppsss, I will try again if $z=8cis40^{\circ}$, then $z^3=8^3 cis120^{\circ}$
 March 2nd, 2014, 10:13 PM #3 Math Team     Joined: Jul 2011 From: North America, 42nd parallel Posts: 3,372 Thanks: 233 Re: De Moivre's formula apply here? Yes , that is correct.

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