Can someone help me with #44 in the ETS math subj practice test?
#44
if Z=e^(2*pi*i/5)
1+Z+Z^2+Z^3+5*Z^4+4*Z^5+4*Z^6+4*Z^7+4*Z^8+5*Z^9=?
the answer is -5e^(3*pi*i/5)
but I can't get it...hope someone here can help~ THx a lot~
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