What is the standard equation of an ellipse with a semi-major axis 'a' and semi-minor axis 'b'?

x^2/a^2 + y^2/b^2 = 1

x^2/b^2 + y^2/a^2 = 1

x^2/a^2 - y^2/b^2 = 1

x^2/b^2 - y^2/a^2 = 1

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