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2. Reciprocal rule - Wikipedia

   en.wikipedia.org/wiki/Reciprocal_rule

   In calculus, the reciprocal rule gives the derivative of the reciprocal of a function f in terms of the derivative of f. The reciprocal rule can be used to show that the power rule holds for negative exponents if it has already been established for positive exponents.

3. List of sums of reciprocals - Wikipedia

   en.wikipedia.org/wiki/List_of_sums_of_reciprocals

   The harmonic mean of a set of positive integers is the number of numbers times the reciprocal of the sum of their reciprocals. The optic equation requires the sum of the reciprocals of two positive integers a and b to equal the reciprocal of a third positive integer c. All solutions are given by a = mn + m 2, b = mn + n 2, c = mn.

4. Crash Course (web series) - Wikipedia

   en.wikipedia.org/wiki/Crash_Course_(web_series)

   A few months later, as $20 million was invested into expanding the initiative, Crash Course secured additional funding via the initiative's Learning Fund program. [ 29 ] [ 30 ] However, PBS Digital Studios remained one of the primary sources of funding Crash Course , and the network also continued to help in finding sponsorships for the show.

5. Reciprocity (social psychology) - Wikipedia

   en.wikipedia.org/wiki/Reciprocity_(social...

   Negative reciprocity occurs when an action that has a negative effect on someone is returned with an action that has an approximately equal negative effect. [ 23 ] [ 28 ] For example, if an individual commits a violent act against a person, it is expected that person would return with a similar act of violence.

6. Open Yale Courses - Wikipedia

   en.wikipedia.org/wiki/Open_Yale_Courses

   Open Yale Courses is a project of Yale University to share full video and course materials from its undergraduate courses. Open Yale Courses provides free access to a selection of introductory courses, and uses a Creative Commons Attribution-Noncommercial- Share Alike license.

7. Sports News & latest headlines from every league - AOL.com

   www.aol.com/sports

   Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.