If the amplitude of a complex number is π/2, then the number is
Purely imaginary
Purely real
0
Neither real nor imaginary
The value of (i)243 is equal to
i
-i
-1
1
z z¯= 0 iff
Re(z) = 0
Im(z) = 0
z = 0
none of these
If x = cosθ + i sinθ then the value of xn + 1/xn is
2 cos n θ
2 i sin n θ
2 sin n θ
2 i cos n θ
The equation having 4 - 3i and 4 + 3i as roots is
x2 + 8x + 25 = 0
x2 + 8x - 25 = 0
x2 - 8x + 25 = 0
x2 - 8x - 25 = 0
Multiplicative inverse of the non-zero complex number (x + iy), (x,y∈R) is
-1+√-3 = re iθ,then θ is equal to
2π/3
-2π/3
π/3
-π/3
is equal to
2i
1 - i
2
Given x2 + 2 = 0, then x =
√2
±√2 i
-2i
The complex number 1 + 2i/1 - i lies in
First quadrant
Second quadrant
Third quadrant
Fourth quadrant
