(xy + z) dz dx dy into an integral in cylindrical coordinates. Convert the integral (D); ,(0). (O) csc(e) dz dr de

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**Image Transcription and Explanation for Educational Website:**

Title: Converting Rectangular Integrals to Cylindrical Coordinates

---

**Text:**

Convert the integral 

\[
\int_{0}^{5} \int_{0}^{y} \int_{0}^{1} (xy + z) \, dz \, dx \, dy
\]

into an integral in cylindrical coordinates.

**Solution in Cylindrical Coordinates:**

\[
\int_{\pi/4}^{\pi} \int_{0}^{\text{csc}(\theta)} \int_{0}^{0} \left( \right) \, dz \, dr \, d\theta
\]

---

**Explanation:**

The problem involves converting a given triple integral from rectangular (Cartesian) coordinates to cylindrical coordinates. Each of the variables \(x\), \(y\), and \(z\) will be transformed using the relationships:

- \(x = r \cos(\theta)\)
- \(y = r \sin(\theta)\)
- \(z = z\)

In cylindrical coordinates, \(\theta\) ranges from \(\pi/4\) to \(\pi\), and \(r\) ranges from 0 to \(\text{csc}(\theta)\). The variable \(z\) has a constant range, from 0 to itself (typically the upper limit derived from context, though in the diagram it appears cut-off). The function inside the integral will be expressed in terms of \(r\), \(\theta\), and \(z\).

**Key Points:**

1. **Integration Limits:**
   - The integration limits adapt to the cylindrical representation, involving trigonometric functions like \(\text{csc}(\theta)\).

2. **Variable Transformation:**
   - Cartesian \(x\)- and \(y\)-coordinates are replaced with cylindrical coordinates \(r\) and \(\theta\).

3. **Jacobian Determinant:**
   - A common step in these conversions is adjusting for the Jacobian determinant which in cylindrical coordinates results in an additional \(r\) factor (though not visible here, it's crucial for complete transformation).

**Conclusion:**

The given expression illustrates the complexity of transforming integrals into different coordinate systems to simplify computation, especially in applications involving symmetry better suited for cylindrical or spherical coordinates.
Transcribed Image Text:**Image Transcription and Explanation for Educational Website:** Title: Converting Rectangular Integrals to Cylindrical Coordinates --- **Text:** Convert the integral \[ \int_{0}^{5} \int_{0}^{y} \int_{0}^{1} (xy + z) \, dz \, dx \, dy \] into an integral in cylindrical coordinates. **Solution in Cylindrical Coordinates:** \[ \int_{\pi/4}^{\pi} \int_{0}^{\text{csc}(\theta)} \int_{0}^{0} \left( \right) \, dz \, dr \, d\theta \] --- **Explanation:** The problem involves converting a given triple integral from rectangular (Cartesian) coordinates to cylindrical coordinates. Each of the variables \(x\), \(y\), and \(z\) will be transformed using the relationships: - \(x = r \cos(\theta)\) - \(y = r \sin(\theta)\) - \(z = z\) In cylindrical coordinates, \(\theta\) ranges from \(\pi/4\) to \(\pi\), and \(r\) ranges from 0 to \(\text{csc}(\theta)\). The variable \(z\) has a constant range, from 0 to itself (typically the upper limit derived from context, though in the diagram it appears cut-off). The function inside the integral will be expressed in terms of \(r\), \(\theta\), and \(z\). **Key Points:** 1. **Integration Limits:** - The integration limits adapt to the cylindrical representation, involving trigonometric functions like \(\text{csc}(\theta)\). 2. **Variable Transformation:** - Cartesian \(x\)- and \(y\)-coordinates are replaced with cylindrical coordinates \(r\) and \(\theta\). 3. **Jacobian Determinant:** - A common step in these conversions is adjusting for the Jacobian determinant which in cylindrical coordinates results in an additional \(r\) factor (though not visible here, it's crucial for complete transformation). **Conclusion:** The given expression illustrates the complexity of transforming integrals into different coordinate systems to simplify computation, especially in applications involving symmetry better suited for cylindrical or spherical coordinates.
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