Implicit derivative of function, calc 3

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SUMMARY

The discussion focuses on finding the implicit derivative dy/dx for the equation sqrt(xy) = 1 + yx^2. The participants derive the expressions for F_x and F_y, where F_x = 2xy - (1/2)(xy)^-0.5 * y and F_y = x^2 - (1/2)(xy)^-0.5 * x. The final expression for dy/dx is established as -A / B, leading to the book's answer of (4(xy)^-1.5 - y) / (x - 2x^2/(sqrt(xy))), achieved by multiplying the numerator and denominator by 2*sqrt(xy).

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  • Understanding of implicit differentiation
  • Familiarity with calculus concepts such as derivatives
  • Knowledge of algebraic manipulation techniques
  • Experience with square roots and their derivatives
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  • Study implicit differentiation techniques in calculus
  • Explore algebraic manipulation for simplifying complex fractions
  • Learn about the chain rule in calculus
  • Review examples of implicit functions and their derivatives
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Students studying calculus, particularly those focusing on implicit differentiation, and educators looking for examples of derivative calculations.

tnutty
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Homework Statement




Find dy/dx ;

sqrt(xy) = 1 + yx^2
or
0 = 1 + yx^2 - sqrt(xy)

Definition :

dy/dx = - F_x / F_y;

A = F_x = 2xy - 1/2 (xy)^-0.5 * y
B = F_y = x^2 - 1/2(xy)^-0.5 * x

Then dy/dx = -A / B

But the answer according to the book, is this :

4(xy)^-1.5 - y
--------------
x - 2x^2/(sqrt(xy))
 
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They just multiplied numerator and denominator by 2*sqrt(xy).
 

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