Is the Integral of sin(xy) with Respect to x Equal to -cos(xy) or -cos(x)?

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When integrating sin(xy) with respect to x, y is treated as a constant. The correct integral is -cos(xy) / y. This distinction is crucial for accurately solving the integral. The discussion emphasizes the importance of recognizing constants in integration. Understanding this concept is essential for proper calculus applications.
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I just need a check on when integrating sin(xy) with respect to x? Does this become -cos(xy) or -cos(x)

thanks
 
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Neither. y is to be treated as a constant. And from that follows?
 
ok....is it -cos(xy) / y
 
yes that's correct.
 
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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