Докажите тождество:
[tex]4a^{2} b^{2} (a^{2}+b^{2})-(a^{2} +b^{2})^{3}=(b^{2}-a^{2})(a^{4}-b^{4}) [/tex]
[tex]4a^{2} b^{2} (a^{2}+b^{2})-(a^{2} +b^{2})^{3}=(b^{2}-a^{2})(a^{4}-b^{4}) [/tex]
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