Numerical approximation of elliptic integrals by quadrature rules

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Compute approximately, using Simpson's formula with n=4n = 4 and n=8n = 8, the integral:

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(1)

∫0π/21−k2sin⁡2xdx\int_{0}^{\pi / 2} \sqrt{1-k^{2} \sin^{2} x} d x, if: а) k2=0,5k^{2} = 0,5; б) k2=0,25k^{2} = 0,25

(2)

∫0π/2dx1−k2sin⁡2x\int_{0}^{\pi / 2} \frac{d x}{\sqrt{1-k^{2} \sin^{2} x}}, if: а) k=0,5k = 0,5; б) k=0,8k = 0,8; в) k=0,9k = 0,9.

Compute the length of an ellipse with eccentricity ε=0,5\varepsilon = 0,5 and semi-axis a=1a = 1, using Simpson's formula with n=6n = 6. Estimate the error of the result.

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Find approximately, with error not exceeding 5⋅10−25 \cdot 10^{-2}, the length of an ellipse with semi-axes a=10a = 10 and b=6b = 6.

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References

[ККЧ+03] Кудрявцев Л.Д., Кутасов А.Д., Чехлов В.И., Шабунин М.И. Интегралы. Ряды. 2-е изд., ФИЗМАТЛИТ, 2003.