SOLUTION: Find the a+ib for of cis(15 degrees). Do this in another way by dividing the a+ib forms of cis(45 degrees) by cis(30 degrees). Check that you get the same results and explain.

Algebra ->  Complex Numbers Imaginary Numbers Solvers and Lesson -> SOLUTION: Find the a+ib for of cis(15 degrees). Do this in another way by dividing the a+ib forms of cis(45 degrees) by cis(30 degrees). Check that you get the same results and explain.      Log On


   

Question 1160395: Find the a+ib for of cis(15 degrees). Do this in another way by dividing the a+ib forms of cis(45 degrees) by cis(30 degrees). Check that you get the same results and explain.
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Find the a+ib for of cis(15 degrees).
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Cis(15) = sin(15) + i*cos(15)
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Do this in another way by dividing the a+ib forms of cis(45 degrees) by cis(30 degrees).
cis(45)/cis(30) = cis(15)
If you want to find sine and cosine of 15 degs, go to Half angle formulas on Wikipedia.
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Check that you get the same results and explain.
Good idea.