m=2a+b; n=3a-2b; |a|=2√2;|b|=3; <(a,b)=45
(m,n)=(2a+b)*(3a-2b)=6a^2-4ab+3ab-2b^2=6a^2-ab-2b^2=
=6*(2√2)^2-2√2*3*cos45-2*3^2=48-6-18=24
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m=2a+b; n=3a-2b; |a|=2√2;|b|=3; <(a,b)=45
(m,n)=(2a+b)*(3a-2b)=6a^2-4ab+3ab-2b^2=6a^2-ab-2b^2=
=6*(2√2)^2-2√2*3*cos45-2*3^2=48-6-18=24