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Differential Geometry
For the curve π‘₯ = 3𝑑, 𝑦 = 3𝑑2, π‘Žπ‘›π‘‘ 𝑧 = 2𝑑3find the equation
of osculating plane.
Solution:
Since π‘Ÿ = π‘₯, 𝑦, 𝑧 = (3𝑑, 3𝑑2, 2𝑑3)
β‡’ π‘Ÿβ€²
= (3,6𝑑, 6𝑑2
)
β‡’ π‘Ÿβ€²β€²
= (0,6,12𝑑)
We know equation of osculating plane
[𝑅 βˆ’ π‘Ÿ, π‘Ÿβ€², π‘Ÿβ€²β€²] = 0
Differential Geometry
β‡’
𝑋 βˆ’ π‘₯ π‘Œ βˆ’ 𝑦 𝑍 βˆ’ 𝑧
π‘₯β€² 𝑦′ 𝑧′
π‘₯β€²β€² 𝑦′′ 𝑧′′
= 0
β‡’
𝑋 βˆ’ 3𝑑 π‘Œ βˆ’ 3𝑑2 𝑍 βˆ’ 2𝑑3
3 6𝑑 6𝑑2
0 6 12𝑑
= 0
Differential Geometry
β‡’ after solving the determinant we get the following
equation of osculating plane
2𝑑2 𝑋 βˆ’ 2π‘‘π‘Œ + 𝑍 = 2𝑑3

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Equ of osculating plane

  • 1. Differential Geometry For the curve π‘₯ = 3𝑑, 𝑦 = 3𝑑2, π‘Žπ‘›π‘‘ 𝑧 = 2𝑑3find the equation of osculating plane. Solution: Since π‘Ÿ = π‘₯, 𝑦, 𝑧 = (3𝑑, 3𝑑2, 2𝑑3) β‡’ π‘Ÿβ€² = (3,6𝑑, 6𝑑2 ) β‡’ π‘Ÿβ€²β€² = (0,6,12𝑑) We know equation of osculating plane [𝑅 βˆ’ π‘Ÿ, π‘Ÿβ€², π‘Ÿβ€²β€²] = 0
  • 2. Differential Geometry β‡’ 𝑋 βˆ’ π‘₯ π‘Œ βˆ’ 𝑦 𝑍 βˆ’ 𝑧 π‘₯β€² 𝑦′ 𝑧′ π‘₯β€²β€² 𝑦′′ 𝑧′′ = 0 β‡’ 𝑋 βˆ’ 3𝑑 π‘Œ βˆ’ 3𝑑2 𝑍 βˆ’ 2𝑑3 3 6𝑑 6𝑑2 0 6 12𝑑 = 0
  • 3. Differential Geometry β‡’ after solving the determinant we get the following equation of osculating plane 2𝑑2 𝑋 βˆ’ 2π‘‘π‘Œ + 𝑍 = 2𝑑3