Simplify : `(1+2i)/(1-2i)-(1-2i)/(1+2i)`

Simplify : (1+i)^(-2)-(1-i)^(-2)

Simplify: (1-i)^2/(1+i)^2

Simplify : (1+i)^(2)+(1-i)^(2)

Simplify : ((1+i)/(1+i))^(2)+((1-i)/(1+i^(2)))

(1+2i)/(1-(1-i)^2)

Simplify [ (1)/(1 - 2i ) + (3)/( 1 + i ) ][ ( 3 + 4i )/( 2 - 4i ) ]

Simplify : (-1+ 2i)+(1/2-i)-(-2- sqrt(-25)) .

Simplify : (i)" "(-2i)((1)/(6)i)" "(ii)" "(-i)(3i)((-1)/(6)i)^(3)" "(iii)" "4 sqrt(-4)+5 sqrt(-9)-3 sqrt(-16)

(1-i)(1+2i)(1-3i)=

Simplify (1-i root 3)/(2+2i)