27.  The real part of an analytic functio...

27.  The real part of an analytic function f(z) where z =.x + jy is given by e-y cos(x). The imaginary  part of  f(z) is

(A) eycos(x) 

(B) e-ysin(x) 

(C) -eysin(x) 

(D) –e-ysin(x)

Hint: 

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