If x=q-p and y=p-q so find x+y+(x-y)-xy.
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x = q-p ----(1)
y= p-q---(2)
x+y+x-y-xy
= 2x-xy
=x(2-y)
=(q-p)[2-(p-q)] since (1) and (2)
=(q-p)[2-p+q]
=
y= p-q---(2)
x+y+x-y-xy
= 2x-xy
=x(2-y)
=(q-p)[2-(p-q)] since (1) and (2)
=(q-p)[2-p+q]
=
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