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eigenvalues {{s_1, c_12}, {c_12, s_2}} - {{s * r_1, s * r_12}, {s * r_12, s * r_2}} * Inverse[{{s_1, c_12}, {c_12, s_2}}] * {{s * r_1, s * r_12}, {s * r_12, s * r_2}}
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