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What is the coolest facts about black holes? What are possible values of total angular momentum for the system of 3 particles with spin 1/2? Precalc question: How would I set up this type of trig word problem? Which is one of my struggle point.? Solve the triangles with the given parts using Law of Sines:? Given vectors u=(1,2) v=(-4,3) and w=(5,-6), find the angle between u and v. the answer is 100.3 degrees. how did they come to that answer?