Machin-like formulae
M000000474: Euler's Machin-like formula
$$\pi=4\arctan\left(\frac{1}{2}\right)+4\arctan\left(\frac{1}{3}\right)$$
Name
Euler's Machin-like formula
Compact formula
4[2] + 4[3]
Lehmer's measure
5.41783
References
Machin, John. Unpublished paper submitted to the Royal Society, 1706.
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