√画像をダウンロード (x-y)^3 identity 186990-(x+y)^3 identity class 9
In mathematics, an identity is an equality relating one mathematical expression A to another mathematical expression B, such that A and B (which might contain some variables) produce the same value for all values of the variables within a certain range of validity In other words, A = B is an identity if A and B define the same functions, and an identity is an equality between