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- A child wanders slowly down a circular staircase from the top of a tower. With x,y,z in feet and the origin at the base of the tower, her position t minutes from the start is given by x=20cost, y=20sint, z=110−5t.How I show that if Y=ax^2 that (d/dx)=2ax(d/dY)?Find ds/dt when θ = 3π/2 if s = cos θ and dθ/dt = 5.