" If "f(z)=(7-z)/(1-z^(2))" where "z=1+2i," then "|f(z)|" is "

If f(z)=(7-z)/(1-z^(2)), where z=1+2 i, then |f(z)| is

If f(z)=(7-z)/(1-z^(2)) where z=1+2i , the |f(z)| is equal to

If f(z)=(1-z^(3))/(1-z) , where z=x+iy with zne1 , then Re bar({f(z)})=0 reduces to

Let Z_(1),Z_(2) be two complex numbers which satisfy |z-i| = 2 and |(z-lambda i)/(z+lambda i)|=1 where lambda in R, then |z_(1)-z_(2)| is

Let f(z) = |(5,3,8),(2,z,1),(1,2,z)| then f(5) is equal to

Let f(z)=[(5,3,8),(2,z,1),(1,2,z)] then f(5) is equal to

If int(x^2-2)/((x^4+5x^2+4)tan^-1((x^2+2)/x))dx=log|f(z)|+c , then (A) f(z)=tan^-1z , where z=sqrt(x+2) (B) f(z)=tan^-1z , where z=x+2/x (C) f(z)=sin^-1z , where z=(x+2)/x (D) none of these

If int(x^2-2)/((x^4+5x^2+4)tan^-1((x^2+2)/x))dx=log|f(z)|+c , then (A) f(z)=tan^-1z , where z=sqrt(x+2) (B) f(z)=tan^-1z , where z=x+2/x (C) f(z)=sin^-1z , where z=(x+2)/x (D) none of these

if z_(1) = 3i and z_(2) =1 + 2i , then find z_(1)z_(2) -z_(1)