T teanido New Member Joined Dec 4, 2005 Messages 29 Gender Female HSC N/A Dec 10, 2006 #1 1 - cos pi/7 + i sin pi/7 ___________________ 1 - cos pi/7 - i sin pi/7 How to simplify that? Whoops, wait, the whole thing is to the power of 7... Last edited: Dec 10, 2006
1 - cos pi/7 + i sin pi/7 ___________________ 1 - cos pi/7 - i sin pi/7 How to simplify that? Whoops, wait, the whole thing is to the power of 7...
J jyu Member Joined Nov 14, 2005 Messages 622 Gender Male HSC 2006 Dec 10, 2006 #2 teanido said: 1 - cos pi/7 + i sin pi/7 ___________________ 1 - cos pi/7 - i sin pi/7 How to simplify that? Click to expand... Multiply top and bottom by the conjugate of the bottom. Expand and simplify using sinsq + cossq =1. Factorise and cancel common factor (2 - 2cos(pi/7)) to obtain -cos(pi/7) + isin(pi/7)
teanido said: 1 - cos pi/7 + i sin pi/7 ___________________ 1 - cos pi/7 - i sin pi/7 How to simplify that? Click to expand... Multiply top and bottom by the conjugate of the bottom. Expand and simplify using sinsq + cossq =1. Factorise and cancel common factor (2 - 2cos(pi/7)) to obtain -cos(pi/7) + isin(pi/7)
T teanido New Member Joined Dec 4, 2005 Messages 29 Gender Female HSC N/A Dec 10, 2006 #3 ... Guess I wasn't thinking today, wrote out the question above wrong, tomorrow got a major 2 hour exam on curve sketching and complex numbers..
... Guess I wasn't thinking today, wrote out the question above wrong, tomorrow got a major 2 hour exam on curve sketching and complex numbers..
blackfriday Pezzonovante Joined Sep 2, 2004 Messages 1,486 Location in ya mum! Gender Undisclosed HSC 2005 Dec 10, 2006 #4 easy topics no sweat.
