Question

a)\(\left(a+b+c\right)^3-\left(a+b-c\right)^3-\left(b+c-a\right)^3-\left(c+a-b\right)^3\)

b)\(2a^2b^2+2b^2c^2-2c^2a^2-a^4-b^4-c^4\)

c)\(\left(a+b\right)^3+\left(b+c\right)^3+\left(c+a\right)^3-8\left(a+b+c\right)^2\)

d)\(\left(a-b\right)^5+\left(b-c\right)^5+\left(c-a\right)^5\)