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What's lewis dot structure of Al(MnO4)3? Calculate the mass for an object that has a density of 29 g/mL and a volume of 5 mL? What is the type of air conditioning system is used in automobile, is it vapour compression refrigeration or air refrigeration? What is cos^2(2x)-sin(2x)? Evaluate √-1(√-1)^2√(-1)^2?