2.12 Simplify each of the following expressions by applying one of the theorems. State the theorem used. (a) (X+YZ)+(X+YZ) (b) [W+X(Y+Z)][W+X(Y+Z)] (c) (VW+UX)(UX+Y+Z+VW) (d) (UV+WX)(UV+WX+YZ) (e) (W+X)(Y+Z)+(W+X)(Y+Z) (f) (V+U+W)[(W+X)+Y+UZ]+[(W+X)+UZ+Y]