Resolver (1 - a ^ 2)(1 - b ^ 2) + 4ab | 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

$$(1-a^{2})(1-b^{2})+4ab$$