Testing big mathematical expressions

$=2[2W(k−2)+(k−1)2k−1]+k2k\=22W(k−2)+(k−1)2k−1+k2k$2[2W(k−2)+(k−1)2k−1]+k2k\=22W(k−2)+(k−1)2k−1+k2k$ 2[2W(k-2) + \frac{(k-1)(2k-1)}{k}] + \frac{k}{2k} = 2 \cdot 2W(k-2) + \frac{(k-1)(2k-1)}{k} + \frac{k}{2k} $=2[2W(k−2)+(k−1)2k−1]+k2k=22W(k−2)+(k−1)2...