5.8 For Part (a), note that the nMOS transistor M3 operates in linear region, and that its drain current must be zero. Consequently, the drain-to-source voltage drop across M3 is also zero. Thus, the CMOS inverter operates at inversion threshold (by definition), and its output voltage is equal to Vth. The remaining parts (b and c) can be solved by straigthforward use of the current-voltage equations.
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