Mathematics · essential
Ellipse focal relation for JEE
Sections of conics, equations of conic sections (parabola, ellipse and hyperbola) in standard forms
Formula
\(c^2=a^2-b^2,\quad e=\dfrac{c}{a}\)
Variables: \(c\) is focal distance, \(e\) is eccentricity.
Conditions: For ellipse \(a>b>0\), hence \(0<e<1\).
Finding foci, eccentricity, directrices.