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If X=x cos theta-y sin theta, Y=x sin t...

If `X=x cos theta-y sin theta, Y=x sin theta+y cos theta and X^(2)+4XY+Y^(2)=Ax^(2)+By^(2), 0 le theta le pi//2`, then :
(where A and B are constants)

A

`theta=(pi)/(6)`

B

`theta=(pi)/(4)`

C

`A=3`

D

`B=-1`

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B, C, D
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