muistikaava

Etymology

 * such named because one is intended to memorize them.

Noun

 * 1)  one of the three formulas describing binomial multiplication (x + y)2 = x2 + 2xy + y2; (x - y)2 = x2 - 2xy + y2; (x + y)(x - y) = x2 - y2
 * 2)  the three formulas collectively