(3a+b)^2-(3a-b)^2=9a^2+6ab+b^2-9a^2+6ab-b^2=12ab;
12*(-3 1/3)*0,3= 12*(-10/3)*3/10=-12
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(3a+b)^2-(3a-b)^2=9a^2+6ab+b^2-9a^2+6ab-b^2=12ab;
12*(-3 1/3)*0,3= 12*(-10/3)*3/10=-12