September 24th, 2013, 04:41 AM  #1 
Senior Member Joined: Sep 2011 From: New York, NY Posts: 333 Thanks: 0  Rectangular Form
Hi, does anyone know how to write in rectagular form?

September 24th, 2013, 04:53 AM  #2 
Senior Member Joined: Jun 2013 From: London, England Posts: 1,316 Thanks: 116  Re: Rectangular Form
You need to use Euler's formula: 
September 24th, 2013, 05:08 AM  #3 
Senior Member Joined: Sep 2011 From: New York, NY Posts: 333 Thanks: 0  Re: Rectangular Form
so if I write it I have but then I am lost there is that already rectangular form? I think it is bc the real part (cosine) is not in terms of z. 
September 24th, 2013, 07:23 AM  #4 
Math Team Joined: Sep 2007 Posts: 2,409 Thanks: 6  Re: Rectangular Form
Do you not know what "rectangular form" means? You have a+ bi with and . I don't know what you mean by "the real part (cosine) is not in terms of z". There is no "z" in anything you write.

September 24th, 2013, 07:40 AM  #5 
Senior Member Joined: Sep 2011 From: New York, NY Posts: 333 Thanks: 0  Re: Rectangular Form
Hey, I'm sorry if that is a stupid question. This is my first exposure to complex variables. I do not have a firm footing yet. In class the professor said to beware was not in rectangular form. That's what I meant. He said cos is the real part and sin is the real part. 
September 24th, 2013, 08:41 AM  #6  
Senior Member Joined: Jun 2013 From: London, England Posts: 1,316 Thanks: 116  Re: Rectangular Form Quote:
So, you can simpify your answer and get rid of the sin and cosine functions.  

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