1.

Consider the two complex numbers z and w, such that w=(z-1)/(z+2)=a+ib, " where " a,b in R " and " i=sqrt(-1). Which of the following is the value of -(b)/(a), whenever it exists?

Answer»

`3tan(theta/2)`
`1/3tan(theta/2)`
`-(1)/(3)cot theta`
`3cot""theta/2`

Answer :D


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