An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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second derivative
  واخنه‌ی ِ دوم  
vâxane-ye dovom
Fr.: dérivée seconde  

In → calculus, the → derivative of a → first derivative. It is usually written as f’’(x), d2y/d2x, or y’’.

See also: → second; → derivative.