हल करना (x2-1)(y2-1)-4xy | Equatix - Math Solver

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Example

3(r+2s)=2t-4

a⋅(b-2)=3b

3(r+2s)=2t-4

a⋅(b-2)=3b

Question

$$(x2-1)(y2-1)-4xy$$