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Find the area of the greatest rectangle ...

Find the area of the greatest rectangle that can be inscribed in an ellipse `x^2/a^2+y^2/b^2=1`

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Reactangle can be inscribed in the ellipse with its sides parallel ot axes of theellipse as shown in the following figure.

Let `P-=(a cos theta, b sin theta)`
`:.` Area o reactangle PQRS
`=(2 a cos theta) (2b sin theta)`
`= 2ab sin 2 theta`
This is maximum when `sin 2 theta=1`
Henece, maximum area `=2ab(1)=2ab`
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