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Are harmonic components and 90 degrees out of phase components are same or different? What is cos^2(2x)-sin(2x)? F(3)=7 and f(c)=11. The average rate of change is 2.5. what is the value of c? av? Calculate the mass for an object that has a density of 29 g/mL and a volume of 5 mL? Why are calcium ions important in bacterial conjunction and transformation (promoters of plasmid uptake)?