Integral of e^(-ax) from evaluated between neg/pos infinity

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    Infinity Integral
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SUMMARY

The integral of e^(-ax) evaluated between negative and positive infinity is a key concept in physics and mathematics. The correct evaluation yields a result of "1/a" for the positive half of the integral, confirming that the integral diverges to infinity as "a" approaches zero. Graphing the function f(x) = e^(-x) illustrates the area under the curve, which is essential for understanding the behavior of exponential decay in various applications.

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Hey guys I am working on a Physics problem and can't figure out a little but of math involved. What is this integral? I tried it out and got "1/a + a", assuming "1/a" is the positive half of the integral.
 
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The integral is infinite.
 
Graph f(x) = e^{-x} and see if you can tell what the area under it is.
 
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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