Equation of tangent

Ellipse of Class 11

Equation of Tangent

(a) At (x1, y1)

Equation of tangent = 1

(b) At (acosθ, bsinθ )

Equation of tangent + = 1

(c) In slope form

y = mx ± Equation of tangent

Equation of Normal

(a) At (x1, y1) is Equation of tangent

(b) At (acosθ, bsinθ ) is axsecθ − bycosecθ = a2 − b2

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