Find Vout for all possible values of Vin. In this problem, Vf is the forward voltage drop across the diode and Vr is the reverse voltage drop across the diode. (You must break the problem into 3 ranges)
I know the ranges are when Vin is positively large enough so that there is a voltage drop across R1=Vf, when Vin is negatively large enough so that there is a voltage drop across R1=Vr, and when Vin is between these two ranges. How would you express Vout in terms of Vin and the resistor values?