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

If `x = X cos theta- Y sin theta, y = X sin theta + Y cos theta and x^2 + 4 x y + y^2 = A X^2 + B Y^2 0 <= theta <= pi/2,` then

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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