Equivalent input admittance problem - how to confirm with LT-spice
You can use .ac list &lt;freq&gt; for a single point analysis in frequency, but that will only give you the magnitudes and the phases, from which you'll have to calculate manually (I used wxMaxima):



Note that I used the reversed voltage source with 180o to plot directly I(V1); just a whim, or not. Or, you can add one more point to the list (the commented out one) so that the waveform viewer appears, and then use the cursors and the builtin math to calculate (be sure to set the Y-axis to linear, for better reading):



Note that the value for the imaginary part appears positive, but the phase it's 180o, which means negative. Or you can choose the cartesian plot and simply plot I(V1)/V(a). Take your pick.