In[1]:= Reduce@8b - a * Sqrt@a ^ 2 + b ^ 2 + 1D - a ^ 2 * Ha * b - Sqrt@a ^ 2 + b ^ 2 + 1DL == 0, a - b * Sqrt@a ^ 2 + b ^ 2 + 1D - b ^ 2 * Ha * b - Sqrt@a ^ 2 + b ^ 2 + 1DL == 0<, 8a, b<, ComplexesD Reduce::useq : The answer found by Reduce contains unsolved equationHsL :0 1 -1 - a - a2 - Power@2D 1 - a 1+a Power@2D Power@2D >. A likely reason for this is that the solution set depends on branch cuts of Mathematica functions. Out[1]= Ha 0 && b 0L ÈÈ Ha - ä && b 1L ÈÈ Ha ä && b äL ÈÈ Ha ä && b 1L ÈÈ Ha 1 && b - äL ÈÈ Ha 1 && b äL ÈÈ Ha 1 && b 1L ÈÈ a H1 + aL I- 1 + a - a2 + a3 M ¹ 0 && 1 0 -1 - a - a 1+a I1 + a + a2 M 2 2 H1 + aL2 I1 + a + a2 M 2 -a H1 + aL2 a && b 1+a
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