2 (arccot [\frac{( + R+h + \sqrt{ cot(a/2) R^2 - 2 h R - h^2 } )}{\cot(a/2) (R+h)-\sqrt{ cot(a/2) R^2 - 2 h R - h^2 }} ] ) , a=pi/2, h=R(sqr(2)-1)

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