Answer :

The given expression is

(s2t + tq2)2 – (2stq)2


= (s2t)2 + 2(s2t)(tq2) + 2(s2t)(tq2)-4s2t2q2


= s4t2 + 2s2t2q2 + 2s2t2q2-4s2t2q2


= s4t2


Therefore ,(s2t + tq2)2 – (2stq)2 = s4t2


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