- One head three tails any order?

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Find the center of a circle that is circumscribed about a triangle whose vertices are P1 (-1, -3), P2 (-2, 4), and P3 (2, 1).? Two factors that affect the shape of molecules? □ cot(arccot 3 + arccot 7 + arccot 13 + arccot 21) is .? Express force F as a Cartesian Vector.I keep getting an impossible angle between + z-axis and the force F. I have shown my work.What's wrong? ClO3-, BrO3-, IO3-, which one is the most stable ? Why?