a*b=0
(2m+3n)*(6m-n)=0
12m²-2mn+18mn-3n²=0
12m²+16mn-3n²=0
12*4+16*|m|*|n|*cosα-3*36=0
|m|*|n|*cosα=3.75
2*6*cosα=3.75
cosα=
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a*b=0
(2m+3n)*(6m-n)=0
12m²-2mn+18mn-3n²=0
12m²+16mn-3n²=0
12*4+16*|m|*|n|*cosα-3*36=0
|m|*|n|*cosα=3.75
2*6*cosα=3.75
cosα=