Question
Factorise : $\left(a^2-b^2\right)\left(c^2-d^2\right)-4 a b c d$
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Answer
$(a c-b d+a d+b c)(a c-b d-a d-b c)$
[Hint. Given Exp. $\left.=(a c-b d)^2-(a d+b c)^2\right]$
[Hint. Given Exp. $\left.=(a c-b d)^2-(a d+b c)^2\right]$
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