invent and prove a formula for the integral:
integral (from t_o to t) of e^(tau*A)d*tau
of the matrix valued function e^(tau*A), where A is a constant n x n matrix.
What restriction does A have to satisfy?
Test your formula by evaluating both sides in the case
A = [0, 1; -1, 0], (i.e. row1 = 0 1, row2 = -1 0)