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). If z=CiStheta, which of the following does hold good?

Answer»

`sin theta=(9B)/(1-4a)`
`COSTHETA=(1-5a)/(1+4a)`
`(1+5a)^(2)+(3b)^(2)=(1-4a)^(2)`
All of these

Answer :C


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