Typos in the mandatory assignment

There were typos in the first version of the mandatory assignment:

- Ex 1: line 9 (displayed formula): rho in the denominator was exchanged by rho^2

- Ex 2: b): There was a T in T_1(T), which should be a small t (i.e. T_1(t)) in the displayed formula.

These typos are now corrected.