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How does a cometâ€™s appearance change as it approaches the sun? Why does this occur? Find the Taylor Series of {z}/{1+z^2} about z=0. Find the region of validity of this Taylor Series.? To find the derivative of f(x)=(1/15)(4x^(3)-69x^(2)+252x) do I use the product rule? If not how do i differentiate? The perimeter of an isosceles triangle is 36. If the ratio of its leg to its base is 2:5, find the length of all 3 sides? If you start with a 5.3 M solution of hydrosulfuric acid (H2S), and have 270 mL of it, how many grams did you need to use?