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An analytic definition of the number π using the cosine

An analytic definition of the number π using the cosine

by Jean Barbet | Feb 20, 2021 | Functions, Number Theory

Introduction When we introduced the circular exponential, the trigonometric functions cosine and sine were defined as its real part and imaginary part. From this, we derived the analytical expressions: \(\cos x=\sum_{n=0}^{+\infty} (-1)^n\dfrac{x^{2n}}{(2n)!}\) and...

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