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(2,3).
المصادر:
1. Maths in a minute: Euler’s identity [Internet]. Plus Maths; 2017 [cited 2022 Nov 4]. Available from: هنا;
2. Wilson R. Euler's Pioneering Equation [Internet]. Oxford University Press; 2018 [cited 5 Dec 2022]. 176. p Available from: هنا
3. Lovász L, Pelikán J, Vesztergombi K. Euler’s Formula. In: Discrete Mathematics. New York, NY: Springer New York; 2003. p. 189–96. Available from: هنا