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Math Help - Implicit Differentiation

  1. #1
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    Implicit Differentiation

    Use implicit differentiation to find an equation of the line tangent to the curve x^3 + 2xy +y^3 = 13 at the point (1, 2).
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  2. #2
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    \begin{array}{l}<br />
 x^3  + 2xy + y^3  = 13 \\ <br />
 3x^2  + \left[ {2y + 2xy'} \right] + 3y^2 y' = 0 \\ <br />
 \end{array}
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