Chapter 7: Triple Integration
Section 7.5: Integration in Spherical Coordinates
Example 7.6.9
If x=ρ cosθsinφ,y=ρ sinθsinφ,z=ρ cosφ, show that ∂x,y,z∂ρ,φ,θ=ρ2sinφ.
Solution
Mathematical Solution
If spherical coordinates are defined by the equations
x=ρ cosθsinφ,y=ρ sinθsinφ,z=ρ cosφ
then the Jacobian is given by
∂x,y,z∂ρ,φ,θ = |xρxφxθyρyφyθzρzφzθ| = cosθsinφρcosθcosφ−ρsinθsinφsinθsinφρsinθcosφρcosθsinφcosφ−ρsinφ0 = ρ2sinφ
Maple Solution - Interactive
Initialize
Tools≻Load Package: Student Multivariate Calculus
Loading Student:-MultivariateCalculus
Context Panel: Assign Name
X=ρ cosθsinφ→assign
Y=ρ sinθsinφ→assign
Z=ρ cosφ→assign
Solution via Context Panel
Write the list X,Y,Z and press the Enter key.
Context Panel: Student Multivariate Calculus≻Differentiate≻Jacobian (See the figure to the right.)
Context Panel: Simplify≻Simplify
X,Y,Z
ρcosθsinφ,ρsinθsinφ,ρcosφ
→Jacobian
cosφ2sinθ2sinφρ2+cosφ2cosθ2sinφρ2+sinθ2sinφ3ρ2+cosθ2sinφ3ρ2
= simplify
sinφρ2
Solution from first principles
Matrix palette: template for a 3×3 matrix
Calculus palette: Partial-differentiation operator
Context Panel: Evaluate and Display Inline
Context Panel: Standard Operations≻Determinant
∂∂ ρ X∂∂ φ X∂∂ θ X∂∂ ρ Y∂∂ φ Y∂∂ θ Y∂∂ ρ Z∂∂ φ Z∂∂ θ Z = →determinantcosφ2sinθ2sinφρ2+cosφ2cosθ2sinφρ2+sinθ2sinφ3ρ2+cosθ2sinφ3ρ2= simplify sinφρ2
Maple Solution - Coded
Install the Student MultivariateCalculus package.
withStudent:-MultivariateCalculus:
Apply the simplify command to the result of the Jacobian command with the determinant option.
simplifyJacobianρ cosθsinφ,ρ sinθsinφ,ρ cosφ,ρ,φ,θ,output=determinant
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