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If a gt 0, b gt 0 then the maximum area ...

If `a gt 0, b gt 0` then the maximum area of the parallelogram whose three vertices are `O(0,0), A(a cos theta, b sin theta) and B(a cos theta, -b sin theta)` is

A

ab when `theta=pi//4)`

B

3ab when `theta=pi//4`

C

ab when `theta= -pi//2`

D

2ab

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