Monday, 1 July 2013

complex numbers - (sqrt3+i)50 in exponential and cartesian form



Having trouble understanding the solution to the following question:



Put (3+i)50 in exponential and cartesian form.



I know the answer cartesian form is:



2502+25032i




And the exponential form is:



250e50π6i



But I don't know how to get there.



I know that i50=i4(12)+2=i2=1. Is that somehow used in the process?
What form is it given in?


Answer



Use the fact that3+i=2(32+i2)=2(cos(π6)+isin(π6)),together with de Moivre's formula.



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