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<math> | <math> | ||
l_2 = \left[\left(n - {1 \over 2} \right)s_h \right]^2 + \left(l -r + r_n \right)^2 | l_2 = \left[\left(n - {1 \over 2} \right)s_h \right]^2 + \left(l -r + r_n \right)^2 | ||
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l -r + r_n = \sqrt{l_2 - \left[\left(n - {1 \over 2} \right)s_h \right]^2} | l -r + r_n = \sqrt{l_2 - \left[\left(n - {1 \over 2} \right)s_h \right]^2} |