"(a\\sdot b)^2-[(a\\times b)\\times b]\\sdot a=(a\\sdot b)^2-[b (a\\sdot b)-a(b\\sdot b)]\\sdot a\n=(a\\sdot b)^2-[(a\\sdot b)(a\\sdot b)-(a\\sdot a)(b\\sdot b)]=(a\\sdot b)^2-[(a\\sdot b)^2-a^2b^2]=a^2b^2"
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