jXc = 1/jωC = -j/1.25*1 = -j0.8 -----> R||Xc = -j*0.8*1/(1-j0.8)
-----> (-j0.8)*(1+j0.8)/(1-j0.8)*(1+j0.8) = 0.3902-j0.4878
Zab = j1.25+ 0.3902-j0.4878 = 0.3902+j0.7622 <-----
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jXc = 1/jωC = -j/1.25*1 = -j0.8 -----> R||Xc = -j*0.8*1/(1-j0.8)
-----> (-j0.8)*(1+j0.8)/(1-j0.8)*(1+j0.8) = 0.3902-j0.4878
Zab = j1.25+ 0.3902-j0.4878 = 0.3902+j0.7622 <-----