Hi
when we use standerd Equation of an ellipse
here 2 formula 1 and 2 when we use 1 and when we use 2
hlep me
There are textbooks in which the "standard equation" for an ellipse is given as $\displaystyle \frac{x^2}{a^2}+ \frac{y^2}{b^2}= 1$ with "a" and "b" always being the lengths to semi-axes in the x and y directions respectively, irrespective of which is longer.
Lesson: don't just memorize formulas, learn what they mean!