\( b^{2}-\left\{a^{2}+a b-\left(a^{2}+b^{2}\right)\right\}-\left[a^{2}-\left\{3 a b-\left(b^{2}-...
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0\( b^{2}-\left\{a^{2}+a b-\left(a^{2}+b^{2}\right)\right\}-\left[a^{2}-\left\{3 a b-\left(b^{2}-a^{2}\right)\right\}\right] \)
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