Consider the differentiability of the stochastic process \{X (t) : t \geq 0\} of Example 4.1 with X^{(1)} (t) = 0 , X^{(2)} (t) = \alpha \sinh (\beta t) , X^(3) (t) = - \alpha \sinh(\beta t), and P [X (t) = X^{(1)} (t)] = 0.50, P [X (t) = X^{(2)} (t)] = P [X (t) = X^{(3)} (t)] =0.25 .