Finding Cartesian equation of parametric surface.

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SUMMARY

The discussion focuses on finding the Cartesian equation of the parametric surface defined by the equations x = 2cos(t)cos(s), y = 3sin(s), and z = sin(t)cos(s). The user attempts to derive the Cartesian equation by squaring each term, resulting in expressions involving 4cos²(t)cos²(s), 9sin²(s), and sin²(t)cos²(s). Additionally, the user inquires about determining constants α and β to express the relationship x² + αy² + βz² = constant, indicating a need for further exploration of the surface's geometric properties.

PREREQUISITES
  • Understanding of parametric equations in three-dimensional space.
  • Familiarity with Cartesian coordinates and their conversion from parametric forms.
  • Knowledge of tangent planes and their equations in multivariable calculus.
  • Basic skills in trigonometric identities and their applications in geometry.
NEXT STEPS
  • Study the conversion of parametric equations to Cartesian forms in multivariable calculus.
  • Learn about the derivation and application of tangent planes to parametric surfaces.
  • Explore the use of Lagrange multipliers for finding constants in geometric equations.
  • Investigate the geometric interpretation of surfaces defined by parametric equations.
USEFUL FOR

Students in calculus or geometry courses, educators teaching multivariable calculus, and anyone interested in the geometric properties of parametric surfaces.

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Homework Statement


Find the Cartesian equation of the parametric surface: [2cos(t)cos(s), 3sin(s), sin(t)cos(s)]

Find eqn. of the tangent plane when S = 0, t = pi/2

Homework Equations


The Attempt at a Solution



I'm not quite sure what to do. All I've done is squared each term, which gave me.

[tex]4cos^2(t)cos^2(s)[/tex]
[tex]9sin^2(s)[/tex]
[tex]sin^2(t)cos^2(t)[/tex]
 
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[tex]x=2\cos t\cos s[/tex]

[tex]y=3\sin s[/tex]

[tex]z=\sin t \cos s[/tex]

Can't you find [tex]\alpha[/tex] and [tex]\beta[/tex] so that [tex]x^2+\alpha y^2 + \beta z^2= constant[/tex]?
 

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