Simplify `(a+b+c)^2-(a-b-c)^2`

Simplify : (a) (a+b+c)(a-b-c)

Simplify (a+b+c)(a+b-c)

Simplify: (a^(2)-(b-c)^(2))/((a+c)^(2)-b^(2))+(b^(2)-(a-c)^(2))/((a+b)^(2)-c^(2))+(c^(2)-(a-b)^(2))/((b+c)^(2)-a^(2))

Simplify : (i) (a+b+c)^2 (ii) (a+b+c)^2-(a-b-c)^2

Simplify. (a+b+c) (a+b+c)

Simplify : (a+b+c)^(2) (ii) (a+b+c)^(2)-(a-b-c)^(2)

Simplify (a+b)(2a-3b+c)-(2a-3b)c.

Simplify (a+b)(2a-3b+c)-(2a-3b)c

Simplify: a^2 (a-b+c)+ b^2 (a+b-c)- c^2 (a-b-c).

Simplify : (a - 2b + c)^3 - (a - 2b)^3 - 3c ( a - 2b +c)(a - 2b)