Find the Jacobian of the transformation. x = 5e-2r sin(20), y= e²r cos(20) a(x, y) = alr, e)

Calculus: Early Transcendentals
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Author:James Stewart
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Chapter1: Functions And Models
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**Find the Jacobian of the transformation.**

Given the transformations:
\[ x = 5e^{-2r} \sin(2\theta) \]
\[ y = e^{2r} \cos(2\theta) \]

Compute the Jacobian:
\[ \frac{\partial (x, y)}{\partial (r, \theta)} = \boxed{\phantom{\frac{dy}{dx}}} \]

**Explanation:**

The problem requires finding the Jacobian determinant of the transformation from polar-like coordinates \((r, \theta)\) to Cartesian-like coordinates \((x, y)\). This involves calculating the determinant of the Jacobian matrix, which consists of first-order partial derivatives as follows:

\[ 
\text{Jacobian matrix} =
\begin{bmatrix}
\frac{\partial x}{\partial r} & \frac{\partial x}{\partial \theta} \\
\frac{\partial y}{\partial r} & \frac{\partial y}{\partial \theta}
\end{bmatrix}
\]

The determinant of this matrix gives the Jacobian determinant, which is used in transformations for integration and understanding change of variables.
Transcribed Image Text:**Find the Jacobian of the transformation.** Given the transformations: \[ x = 5e^{-2r} \sin(2\theta) \] \[ y = e^{2r} \cos(2\theta) \] Compute the Jacobian: \[ \frac{\partial (x, y)}{\partial (r, \theta)} = \boxed{\phantom{\frac{dy}{dx}}} \] **Explanation:** The problem requires finding the Jacobian determinant of the transformation from polar-like coordinates \((r, \theta)\) to Cartesian-like coordinates \((x, y)\). This involves calculating the determinant of the Jacobian matrix, which consists of first-order partial derivatives as follows: \[ \text{Jacobian matrix} = \begin{bmatrix} \frac{\partial x}{\partial r} & \frac{\partial x}{\partial \theta} \\ \frac{\partial y}{\partial r} & \frac{\partial y}{\partial \theta} \end{bmatrix} \] The determinant of this matrix gives the Jacobian determinant, which is used in transformations for integration and understanding change of variables.
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