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Unit Vectors Tangent and Normal to a Curve

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Find the unit vectors that are tangent and normal to the curve at the given point: (four vectors in all).

4x² + y² = 16 , (√2, -2√2)

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This shows unit vectors tangent and normal to a curve.

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Please see the attachment.

The equation is , at point .
First, we make derivatives on ...

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