2. Consider the case zmvp=rf in the Markowitz model with a risk-free asset (and follow the notations therein), where the optimal portfolio (with expected return z) is given on Page 39 of Lecture Notes 2 . Denote a=e1e,c=r1r, and denote 2 as the variance of the portfolio. Calculate 2(zrf)2 and express it in terms of a,c, and rf. (Hint: utilize the expression for zmvp.) 2. Consider the case zmvp=rf in the Markowitz model with a risk-free asset (and follow the notations therein), where the optimal portfolio (with expected return z) is given on Page 39 of Lecture Notes 2 . Denote a=e1e,c=r1r, and denote 2 as the variance of the portfolio. Calculate 2(zrf)2 and express it in terms of a,c, and rf. (Hint: utilize the expression for zmvp.)