Chapter 2, Boolean Algebra and Gate Logic Design 64 2.12 Simplify the following expressions by first forming the complements of the expressions. Second by simplifying the complemented expression. And, third, by complementing the simplified expression a) (x+ y+z(x'+y+z)x y'+z b) y(y+z+x)z' c) x+ y(x+y(z+x)(z'+x)