Dear sir please.solve question 3b

ax / a= ax-y
Then, the first term becomes:
a(x-y)( x2 +xy + y2)  = a(x3 - y3)
Proceeding like this:
The given expression reduces to,
a(x3 - y3) . a( y3 - z3) . a(z3 - x3) = a( x3-y3+y3-z3+z3-x3) = a= 1
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