[egin{bmatrix}egin{pmatrix}- frac{1}{2 a - 2 c} left(- a^{2} - b^{2} + c^{2} + d^{2} + r_{1}^{2} - r_{2}^{2} + left(2 b - 2 d ight) left(- frac{4}{8 a^{2} - 16 a c + 8 b^{2} - 16 b d + 8 c^{2} + 8 d^{2}} sqrt{- left(a - c ight)^{2} left(- a^{2} + 2 a c - b^{2} + 2 b d - c^{2} - d^{2} + r_{1}^{2} - 2 r_{1} r_{2} + r_{2}^{2} ight) left(- a^{2} + 2 a c - b^{2} + 2 b d - c^{2} - d^{2} + r_{1}^{2} + 2 r_{1} r_{2} + r_{2}^{2} ight)} - frac{1}{2 a^{2} - 4 a c + 2 b^{2} - 4 b d + 2 c^{2} + 2 d^{2}} left(- a^{2} b - a^{2} d + 2 a b c + 2 a c d - b^{3} + b^{2} d - b c^{2} + b d^{2} + b r_{1}^{2} - b r_{2}^{2} - c^{2} d - d^{3} - d r_{1}^{2} + d r_{2}^{2} ight) ight) ight), & - frac{4}{8 a^{2} - 16 a c + 8 b^{2} - 16 b d + 8 c^{2} + 8 d^{2}} sqrt{- left(a - c ight)^{2} left(- a^{2} + 2 a c - b^{2} + 2 b d - c^{2} - d^{2} + r_{1}^{2} - 2 r_{1} r_{2} + r_{2}^{2} ight) left(- a^{2} + 2 a c - b^{2} + 2 b d - c^{2} - d^{2} + r_{1}^{2} + 2 r_{1} r_{2} + r_{2}^{2} ight)} - frac{1}{2 a^{2} - 4 a c + 2 b^{2} - 4 b d + 2 c^{2} + 2 d^{2}} left(- a^{2} b - a^{2} d + 2 a b c + 2 a c d - b^{3} + b^{2} d - b c^{2} + b d^{2} + b r_{1}^{2} - b r_{2}^{2} - c^{2} d - d^{3} - d r_{1}^{2} + d r_{2}^{2} ight)end{pmatrix}, & egin{pmatrix}- frac{1}{2 a - 2 c} left(- a^{2} - b^{2} + c^{2} + d^{2} + r_{1}^{2} - r_{2}^{2} + left(2 b - 2 d ight) left(frac{4}{8 a^{2} - 16 a c + 8 b^{2} - 16 b d + 8 c^{2} + 8 d^{2}} sqrt{- left(a - c ight)^{2} left(- a^{2} + 2 a c - b^{2} + 2 b d - c^{2} - d^{2} + r_{1}^{2} - 2 r_{1} r_{2} + r_{2}^{2} ight) left(- a^{2} + 2 a c - b^{2} + 2 b d - c^{2} - d^{2} + r_{1}^{2} + 2 r_{1} r_{2} + r_{2}^{2} ight)} - frac{1}{2 a^{2} - 4 a c + 2 b^{2} - 4 b d + 2 c^{2} + 2 d^{2}} left(- a^{2} b - a^{2} d + 2 a b c + 2 a c d - b^{3} + b^{2} d - b c^{2} + b d^{2} + b r_{1}^{2} - b r_{2}^{2} - c^{2} d - d^{3} - d r_{1}^{2} + d r_{2}^{2} ight) ight) ight), & frac{4}{8 a^{2} - 16 a c + 8 b^{2} - 16 b d + 8 c^{2} + 8 d^{2}} sqrt{- left(a - c ight)^{2} left(- a^{2} + 2 a c - b^{2} + 2 b d - c^{2} - d^{2} + r_{1}^{2} - 2 r_{1} r_{2} + r_{2}^{2} ight) left(- a^{2} + 2 a c - b^{2} + 2 b d - c^{2} - d^{2} + r_{1}^{2} + 2 r_{1} r_{2} + r_{2}^{2} ight)} - frac{1}{2 a^{2} - 4 a c + 2 b^{2} - 4 b d + 2 c^{2} + 2 d^{2}} left(- a^{2} b - a^{2} d + 2 a b c + 2 a c d - b^{3} + b^{2} d - b c^{2} + b d^{2} + b r_{1}^{2} - b r_{2}^{2} - c^{2} d - d^{3} - d r_{1}^{2} + d r_{2}^{2} ight)end{pmatrix}end{bmatrix}]