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Fungrim entry: fc8149

π=1111x2dx\pi = \int_{-1}^{1} \frac{1}{\sqrt{1 - {x}^{2}}} \, dx
TeX:
\pi = \int_{-1}^{1} \frac{1}{\sqrt{1 - {x}^{2}}} \, dx
Definitions:
Fungrim symbol Notation Short description
Piπ\pi The constant pi (3.14...)
Integralabf(x)dx\int_{a}^{b} f(x) \, dx Integral
Sqrtz\sqrt{z} Principal square root
Powab{a}^{b} Power
Source code for this entry:
Entry(ID("fc8149"),
    Formula(Equal(Pi, Integral(Div(1, Sqrt(Sub(1, Pow(x, 2)))), For(x, -1, 1)))))

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2021-03-15 19:12:00.328586 UTC