I am studying the sound wave equation deducted by Feynman in his lectures. In section(adsbygoogle = window.adsbygoogle || []).push({}); 47-3:

P) =_{0}+ P_{e}= f(d_{0}+ d_{e}f(d+ d_{0})_{e}f'(d_{0})

Wheref'(dstands for the derivative of_{0})f(d)evaluated atd=d. Also,_{0}dis very small._{e}

I do not understand the second step of the equality. Can anyone help me?

Link to the lectures: http://www.feynmanlectures.caltech.edu/I_47.html#Ch47-S1

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# Sound Wave Equation Deduction

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