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    An Implicit Differentiation problem

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    Find the slope of the tangent line at the indicated point.

    (a) Witch of Agnessi
    (x^2 + 4)y = 8
    Point: (2, 1)

    (b) Bifolium
    (x^2 + y^2)^2 = 4(x^2)y
    Point: (1,1)

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    The solution provides a theoretical explanation and then a very detailed and step-by-step work-out for the problem.