Tangent to ellipse at a point (xx₁/a² + yy₁/b² = 1)

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xx₁/a² + yy₁/b² = 1

What each symbol means

Symbol	What it stands for
a,b	Semi axes
(x_1,y_1)	Point on ellipse

When to use this

Point satisfies x₁²/a²+y₁²/b²=1.