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December 27th, 2017, 04:09 AM  #1 
Senior Member Joined: Oct 2015 From: Greece Posts: 115 Thanks: 8  Complex Number to Polar form with Real = 0!!!
Hello! I have this complex number: $0 + j\times 89,75$ Our professor told us $0 + j\times 89,75$ to polar is: $89,75\angle 90$ He also told us Cartesian to polar convertion: $\sqrt{a^{2}+b^{2}}\angle{\tan^{1}(b/a)}$ So let's convert $0 + j\times 89,75$ to polar: First of all $\sqrt{a^{2}+b^{2}} = \sqrt{0^{2}+89,75^{2}} = 89,75$ but: $\tan^{1}(b/a)$ , a = 0!!!!! So how? Last edited by skipjack; December 27th, 2017 at 09:22 AM. 
December 27th, 2017, 06:36 AM  #2  
Math Team Joined: Jul 2011 From: Texas Posts: 2,885 Thanks: 1504  Quote:
 
December 27th, 2017, 03:15 PM  #3 
Senior Member Joined: Sep 2016 From: USA Posts: 599 Thanks: 366 Math Focus: Dynamical systems, analytic function theory, numerics 
You can't learn math if you still think its just a bunch of formulas. Put down the formula and just look at the vector you have written and tell me its polar angle. Once you do this, you will easily see how to correct the formula to account for this case.

December 28th, 2017, 12:21 PM  #4  
Senior Member Joined: Oct 2015 From: Greece Posts: 115 Thanks: 8  Quote:
Sometimes you need to think before you ask something i guess  

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complex, form, number, polar, real 
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