write the formula of eccentricity to find the equation of directrices of horizontal ellipse
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To find the eccentricity of an ellipse. This is basically given as e = (1-b2/a2)1/2. Note that if have a given ellipse with the major and minor axes of equal length have an eccentricity of 0 and is therefore a circle.
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if an ellips has centre (0,0) eccentricity e and semi major axis a in the x direction , then its foci are at (+ae,0) and its directrices are x=+a/e.
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