The integral of sinh(2x) cosh(2x) can be solved by using the substitution u = sinh(2x), leading to du = 2 cosh(2x) dx. The integral simplifies to 1/2 ∫ u du, resulting in (sinh(2x))^2 / 4. A noted typo in the differentiation process was the omission of "dx" in the expression for du. Additionally, the integration constant was not included in the final answer, which is essential for completeness. Verifying the solution by differentiating is recommended to ensure accuracy.
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?