Question: In the triangle ABC, AB(vector) = 9i + 2j and AC(vector) = 7i 6j. a. Find BC(vector) . b. Prove that the triangle ABC

In the triangle ABC, AB(vector) = 9i + 2j and AC(vector) = 7i − 6j.

a. Find BC(vector) .

b. Prove that the triangle ABC is isosceles.

c. Show that cos ∠ABC = 1/√5

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