6.Which one of the following functions, where z = x+ jy is a complex variable, is analytic? (A) f(2)=, where =x-jy. (B) f(z) = xy+jx (C)f(z)=x2ーjy2 (D) f(z)=x2+y2+j2xy (E) None of the above statements are correct.

4.Consider the following three systems, where [n] or x(t) is the system input, y[n] or y(t) denotes the system output, and I.Which of the following statements is correct? (A) I is time-invariant, II is linear, Ill is causal. (B) I is memoryless, II is causal, III is nonlincar. (C) I is stable, II is linear, III is memoryless. (D) I is causal, II is memoryless, III is linear. (E) None of the above statements are correct.

6.Which one of the following functions, where z = x+ jy is a complex variable, is analytic?
(A) f(2)=, where =x-jy.
(B) f(z) = xy+jx
(C)f(z)=x²ーjy²
(D) f(z)=x²+y²+j2xy
(E) None of the above statements are correct.

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