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      <text>11.7.0 Introduction implicit differentiation</text>
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      <text><![CDATA[<h4>Introduction </h4>

This Section introduces implicit differentiation which is used to differentiate functions expressed in implicit form (where the variables are found together). Examples are \(x^3 + xy + y^2 = 1\), and \( \dfrac{x^2}{a^2} + \dfrac{y^2}{b^2} = 1 \) which represents an ellipse.]]></text>
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