(a-b)2=a2-2ab+b2
(2-b)2=±
±
b
±
b2
(a-1)2=±
a2±
a
±
(2a-b)2=±
*
2
±
*
*b
±
b2
(a-1b)2=±
a2±
*a*
+
*
2
(2-t)2=±
±
4t±
t2
(2-t)*(2-t)=±
±
4t±
t2
(t-2)*(2-t)=±
t2±
4t±
(11-z)*(11-z)=±
±
z
±
z2
(x-6)*(6-x)=±
x2±
x
±
(11ax-bz)*(11ax-bz)=±
*(
)2
±
*
*bz
±
(bz)2
(vt-6up)*(6up-vt)=±
(vt)2±
*vt*
±
*(
)2
(6-z)*(6-z)=±
±
z
±
z2
(2-x)*(x-2)=±
x2±
x
±
(6x-bz2)*(6x-bz2)=±
*(
)2
±
*
*bz2
±
(bz2)2
(11dp-t)*(t-11dp)=±
t2±
*t*
±
*(
)2