1.

Evaluate using the identity (a + b)2 = a2 + 2ab + b2(p2 – q2)2

Answer»

(a – b)2 = a2 – 2ab + b2 

Here a = p2 , b = q2 

(p2 – q2)2 = (p2)2 – (2)(p2)(q2) + (q2)2 

= p4 – 2p2q2 + q4



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