29 Numerics library [numerics]

29.9 Mathematical functions for floating-point types [c.math]

29.9.5 Mathematical special functions [sf.cmath]

29.9.5.5 Complete elliptic integral of the second kind [sf.cmath.comp_ellint_2]

double comp_ellint_2(double k); float comp_ellint_2f(float k); long double comp_ellint_2l(long double k);

1
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Effects: These functions compute the complete elliptic integral of the second kind of their respective arguments k.

2
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Returns:

E(k)=E(k,π/2),for |k|≤1

where k is k.

3
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See also [sf.cmath.ellint_2].