Ellipse: tangent at (x₁, y₁) (Replace one x²→xx₁ and y²→yy₁ in ellipse equation)
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Replace one x²→xx₁ and y²→yy₁ in ellipse equation
What each symbol means
| Symbol | What it stands for |
|---|---|
| x_1,y_1 | Point on ellipse |
When to use this
x₁²/a² + y₁²/b² = 1.