The sum of the three cube roots of unity is
1
-1
0
ω
The multiplicative inverse of 2+2i is
1/2 - 1/2 i
1/4 - 1/4 i
1/2 - 1/4 i
1/4 - 1/2 i
5/i3 =
5/i
5i
5
-5
The value of (1 + i)8 + (1 - i)8 is
16
22
32
-32
Find the modulus of sin α - i cos α
sin2α
Cos2α
2
The values of x and y, if 2x + 4i y = -i3 x - y + 3 are
1/3, 4/3
4/3, 1/3
2/3, 1/3
1/3, 2/3
Express in the form b or bi, where b is a real number.
i
-i
2i
- 2i
The product of three cube roots of unity is
ω2
7/5
-7/5
-7/15
7/15
Z2
Z