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thanks(:

erm...The product \[(a − b)(a − b) = a^2 -2ab + b^2\]

so the answer is not always?

i guess it could be true of b was zero

it would not be true if
\[a=0\]

@satellite73
it true for both man , when it is a=0 0r b=0

Sometimes,
(a-b)^2=a^2-b^2 iff b=0
if a=0, b not equal to zero, then
(a-b)^2=+b^2
a^2-b^2=-b^2