I have a question.

I'm doing a cube.

(a+b)^3

the book says it should be the following.

(a+b)^3 = a^3 + 3a^2b + 3ab^2 + b^3

but one of my b variable is delta

(1) unsure how to make delta on the post.

so we will use this to resemble delta

so the actual problem is this.

(x+x)^3

when cubing this, would i square and cube delta?

x^3+3x^3+3x^3^2+^3x^3