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  • [[File:TangentGraphic2.png|300px|thumb|Linear approximation of a smooth function <ref>http://en.wikipedia.org/wiki/Linear_approximation [[Linear approximation]] refers to the simple model of any phenomenon, based on the linear function.
    4 KB (670 words) - 18:46, 30 July 2019
  • [[File:Union of Soviet Socialist Republics orthographic projection.png|right|200px]] [[File:USSRchildren.jpg|400px|thumb|History of the USSR by [[Alexandr Korolev]] <!-- <ref>https://www.facebook.com/photo.p
    11 KB (1,321 words) - 18:44, 30 July 2019