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1.1.5 Complex Numbers
You can enter complex numbers in Mathematica just by including the constant I, equal to  . Make sure that you type a capital I
.
This gives the imaginary number result 
.
In[1]:= Sqrt[-4]
Out[1]= 
This gives the ratio of two complex numbers.
In[2]:= (4 + 3 I) / (2 - I)
Out[2]= 
Here is the numerical value of a complex exponential.
In[3]:= Exp[2 + 9 I] //N
Out[3]= 
Complex number operations.
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