I. Find the equations of the tangent and normal lines at a specified point. 1. y= v1- x3 at (12,V3) 4.X 2. y= 1+x2 at (1,2) 3. y= x* + 2x- at (1,3) 4. f(x) = x2 + 3x+ 1 atx = 0 and 4 5. y = xcosx at (0, 0) II. Solve the following: 1. Find the equation of the normal line to curve y = sin3x at x = =. 2. The sum of two positive numbers is 50. What are the numbers if their product is to be maximum