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Original Message (ID '313982') By yehuda:
you need to add the assumption that fg>0 to Solve R1=1*10^6; C1=100*10^-9; sys=(s*R1*C1)/(1+s*R1*C1); A=Abs[sys/.{s->2\[Pi] fg*I}]; Solve[A==1/Sqrt[2]&&fg>0,fg] returns {{fg->5/\[Pi]}} as expected yehuda