Assuming that DAE and CAB are congruent, EC would be a length of 2 units dont trust me wait for somebody else to answer though im not 100% sure

That's 5 f's so lets do it f(1) = -1/1 = -1 f(-1) = -1/-1 = 1 f(1) = -1/1 = -1 f(-1) = -1/-1 = 1 f(1) = -1/1 = -1 so f(f(f(f(f(1))))) is -1

If we graph this equation on Desmos, we will see the range is [-2.5,8]