(pq+rt)²-2pqrt
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(a+ b)^2 - 2ab = a^2 + b^2.
And ,
a = pq and b = rt.
So, (pq+rt)²-2pqrt =
(pq)^2 + (rt)^2+2pqrt -2pqrt i.e. p^2 q^2 + r^2 t^2.
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