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How to do this?? How to show that the equation 16x^2+4y^2-64x-40y+100=0 represents ellipse? Find centre,foci,vertices? How do you become a butterfly? Mixing HCl and NAOH, how to determine final ph? The number of ways in which 5 persons {P,Q,R,S} and {T} can be seated in a ring so that P sits between Q and R is? How did the first humans know to use their arms to move something or legs to move?