Diferencia de cuadrados de (a - b)² - (c + d)²?

(a - b)² - (c + d)²

se aplica

<img src="https://tex.z-dn.net/?f=x%5E2-y%5E2%3D%5Cleft%28x%2By%5Cright%29%5Cleft%28x-y%5Cright%29%20" />

<img src="https://tex.z-dn.net/?f=%3D%5Cleft%28%5Cleft%28a-b%5Cright%29%2B%5Cleft%28c%2Bd%5Cright%29%5Cright%29%5Cleft%28%5Cleft%28a-b%5Cright%29-%5Cleft%28c%2Bd%5Cright%29%5Cright%29%20" />

desarrollando los parentesis

<img src="https://tex.z-dn.net/?f=%3D%5Cleft%28a%2Bc%2Bd-b%5Cright%29%5Cleft%28a-b-c-d%5Cright%29" />.