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Simplify expression like " Conjugate[Sqrt[z]] " for z>0


In[86]:=Simplify[Conjugate[Sqrt[-(t Cos[2 kx] Cos[ky]) + Cos[kx] +
M] ], -(t Cos[2 kx] Cos[ky]) + Cos[kx] + M > 0]

Out[86]= Sqrt[-t cos(2 kx) cos(ky)+cos(kx)+M]^\[Conjugate]

I don't want that  ^\[Conjugate], why it is there?


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