Question
Engineering Mathematics Question on Analytic functions
Let f(z) be an analytic function, where z = x + iy. If the real part of f(z) is cosh x cos y, and the imaginary part of f(z) is zero for y = 0, then f(z) is
A
cosh x exp (-iy)
B
cosh z exp z
C
cosh z cos y
D
cosh z
Answer
cosh z
Explanation
Solution
The correct option is (D): cosh z