Question 970836

{{{(a+b+c)(b+c-a)(c+a-b)(a+b-c) }}}................multiply first two and then second two

{{{(ab+ac-a^2+b^2+bc-ab+bc+c^2-ac)(ac+bc-c^2+a^2+ab-ac-ab-b^2+bc) }}}

{{{(-a^2+b^2+2bc+c^2)(a^2-b^2+2bc-c^2)}}}.....multiply these two and you will get


{{{-a^4+2a^2 *b^2+2a^2* c^2-b^4+2b^2*c^2-c^4}}}