I need the formula of (a-b-c)2
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(x+y+z)^2= x^2+y^2+z^2+2xy+2yz+2zx
[a+(-b)+(-c)]^2= a^2+(-b)^2+(-c)^2+2*a*(-b)+2*(-b)*(-c)+2*(-c)*a
=a^2+b^2+c^2-2ab+2bc-2ca
[a+(-b)+(-c)]^2= a^2+(-b)^2+(-c)^2+2*a*(-b)+2*(-b)*(-c)+2*(-c)*a
=a^2+b^2+c^2-2ab+2bc-2ca
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