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plz help If A=(2,1), B=(1,2), C=(3,1) Find the angle ABC using scalar products

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plz help If A=(2,1), B=(1,2), C=(3,1) Find the angle ABC using scalar products...

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plz help If A=(2,1), B=(1,2), C=(3,1) Find the angle ABC using scalar products​

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plz help If A=(2,1), B=(1,2), C=(3,1) Find the angle ABC using scalar products