Geodesic
It's useful to solve differential equations
Matematičeskoe obrazovanie, Tome 87 (2018) no. 3, pp. 7-11.

Voir la notice de l'article provenant de la source Math-Net.Ru

An interesting example is discussed, where a problem of integrating is solved by methods of differential equations.
Keywords: The area of a curvilinear trapezium, the integral, the simplest differential equation, the general solution. 
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     author = {S. V. Dvoryaninov},
     title = {It's useful to solve differential equations},
     journal = {Matemati\v{c}eskoe obrazovanie},
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S. V. Dvoryaninov. It's useful to solve differential equations. Matematičeskoe obrazovanie, Tome 87 (2018) no. 3, pp. 7-11. http://geodesic.mathdoc.fr/item/MO_2018_87_3_a1/