Area of ellipse

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Proof of area of ellipse
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I really liked the rigor when you mentioned about y is not a function and why you started with upper half

prasannakannan
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Really good prathik.. I had forgotten trig sub since it’s been a while. A brief explanation of that and an explanation of integral cos squared theta would have been awesome for someone like me who hasn’t done integrals in decades :).. adding an statement that if a=b the it boils down to area of circle would have added an intuitive touch

prasannakannan