10. Prove the following properties of Boolean algebras. Give areason for each step. a. (x+y)+(y x?)=x+y
b. (y+x)#(z+y)+x#z#(z+z?)=y+x#z
c. (y?#x)+x+(y+x)#y?=x+(y?#x) ##
d. (x+y?) z=#3(x?+z?) (y+z?)4?
e. (x#y)+(x?#z)+(x?#y#z?)=y+(x?#z)
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