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how do i raise to the i power? For example, 4 to the power of i. (SQRT -1)

Guest May 24, 2015

Best Answer 

 #2
avatar+122 
+5

correction to last bit,typo error-

the equals sign should be a plus sign where it reads cos(ln4)=isin(ln4).Should read 

cos(ln4)+isin(ln4)

 

Sorry!

Mathcad  May 24, 2015
 #1
avatar+122 
+5

Answer,then I'll explain.

4^i =cos(ln4)+isin(ln4).

Why? Recall that I can write any number I please,let's say X as always,as

X=e^lnX because e^x and lnX are inverses. So I will write 4^i as e^ln(4^i).

Using laws of logs,ln(4^i)=i(ln4).Now I will use Euler's formula e^ix =cosx +isinx.

We now have 4^i= e^ln(4^i) = e^i(ln4)= cos (ln4)=isin(ln4). This is a deep result which should show you that the set of complex numbers ( the all-encompassing number set) is fundamentally sinusoidal. If you have understood this,now look at the Riemann Zeta function and you will be able to appreciate the beauty of it.Me,I'm off for a beer......

Mathcad  May 24, 2015
 #2
avatar+122 
+5
Best Answer

correction to last bit,typo error-

the equals sign should be a plus sign where it reads cos(ln4)=isin(ln4).Should read 

cos(ln4)+isin(ln4)

 

Sorry!

Mathcad  May 24, 2015
 #3
avatar+92624 
0

Thanks Mathcad    

Melody  May 25, 2015

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