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(1/2+z)(1/2-z)=1/4-z²
(3a+2b)(3a-2b)=(3a)²-(2b)²=9a²-4b²
(w+h)(w-h)=w²-h²
(xt+yp)(xt-yp)=x²t²-y²p²
...............Kd