(b-c)(b+c)^2+(c-a)(c+a)^2+(a-b)(a+b)^2=-(a-b)(b-c)(c-a)
b^3+b^2c-bc^2+c^2a-ca^2-a^3+(a-b)*(a+b)^2+(a-b)*(b-c)*(c-a)=0
b^2c-bc^2+c^2a-ca^2+a^2b-ab^2-a^2b-ac^2+a^2c-b^2c+b^2a+bc^2=0
b^2c-bc^2+c^2a-ca^2-ab^2-ac^2+a^2c-b^2c+b^2a+bc^2=0
b^2c-bc^2-ab^2-b^2c+b^2a+bc^2=0
-bc^2-ab^2+b^2a+bc^2=0
-bc^2+bc^2=0
0=0Тождество доказано!
(b-c)(b+c)^2+(c-a)(c+a)^2+(a-b)(a+b)^2=-(a-b)(b-c)(c-a)
b^3+b^2c-bc^2+c^2a-ca^2-a^3+(a-b)*(a+b)^2+(a-b)*(b-c)*(c-a)=0
b^2c-bc^2+c^2a-ca^2+a^2b-ab^2-a^2b-ac^2+a^2c-b^2c+b^2a+bc^2=0
b^2c-bc^2+c^2a-ca^2-ab^2-ac^2+a^2c-b^2c+b^2a+bc^2=0
b^2c-bc^2-ab^2-b^2c+b^2a+bc^2=0
-bc^2-ab^2+b^2a+bc^2=0
-bc^2+bc^2=0
0=0
Тождество доказано!