Complex numbers question;

ω=cos(2π/7)+i sin(2π/7).

α=ω+ω^2+ω^4

Find value of
2α=

Question

Complex numbers question;

ω=cos(2π/7)+i sin(2π/7).

α=ω+ω^2+ω^4

Find value of  
2α=

anonymous · Answer

$$e^{ix}=cos(x)+isin(x)$$
i'd suggest re-writing it as:
$$ω=e^{i2π/7}$$

anonymous · Answer

i did so just as you have stated and then tried to solve it but what i need is how to simplify solving alpha

anonymous · Answer

wow, wolfram says it is equivalent to:
$$-1 + i\sqrt7$$

anonymous · Answer

yes it is the correct answer but we donot get to use calcs anything else while solving

anonymous · Answer

i'll ask a big gun to check this out. i haven't seen this

@Zarkon please shed light if you can

anonymous · Answer

2 more because I really want to know.

come see this please @UsukiDoll and @dan815

dan815 · Answer

|dw:1385787693781:dw|