Question 620843
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Hi, Sry, misunderstood the question:
Find the angle between (-6, 8)and(-2,-5) 
cos&#952; = (u • v)/|u||v| = {{{((-6)(-2) + (8)(-5))/sqrt(100)sqrt(29) =( -28)/10sqrt(29)}}} , &#952; = 121°