Real & Imaginary Parts of z+(1/z) in x+\imathy

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To find the real and imaginary parts of the expression z + (1/z) where z = x + iy, the first step involves substituting z into the equation. The expression simplifies to (x + iy) + (1/(x + iy)). To compute 1/(x + iy), multiply the numerator and denominator by the conjugate, resulting in a real part of (x/(x^2 + y^2)) and an imaginary part of (-y/(x^2 + y^2)). Combining these results provides the overall real and imaginary components of z + (1/z). The solution reveals the relationship between the variables x and y in the context of complex numbers.
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z=x+\imathy Find the real and imaginary parts z+(1/z)
 
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Question: A clock's minute hand has length 4 and its hour hand has length 3. What is the distance between the tips at the moment when it is increasing most rapidly?(Putnam Exam Question) Answer: Making assumption that both the hands moves at constant angular velocities, the answer is ## \sqrt{7} .## But don't you think this assumption is somewhat doubtful and wrong?

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