( _Advanced Mathematics for AS and A level 2_ (A-level mathematics), Haese Mathematics (2018) [978-1-925489-32-3](http://www.haesemathematics.com/books/advanced-mathematics-2-for-a-level) より許可を得て転載)
( _Advanced Mathematics for AS and A level 2_ (A-level mathematics), Haese Mathematics (2018) [978-1-925489-32-3](http://www.haesemathematics.com/books/advanced-mathematics-2-for-a-level) より許可を得て転載)