(b) For a bond with periodic coupon payments, the i-th cash flow is discounted using 1/(1+y/m)'. Show that 1/(1+y/m)' is a convex function of y. (c) Show that Formula 2.2 for the price of a coupon bond is a convex function of yield. (Hint: Use result from the previous step. (b) For a bond with periodic coupon payments, the i-th cash flow is discounted using 1/(1+y/m)'. Show that 1/(1+y/m)' is a convex function of y. (c) Show that Formula 2.2 for the price of a coupon bond is a convex function of yield. (Hint: Use result from the previous step