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Let 0le theta le pi/2 x=Xcos theta + Ysi...

Let `0le theta le pi/2` `x=Xcos theta + Ysin theta` `y=Xsin theta - Y cos theta` such that `x^2+4xy+y^2=aX^2+bY^2` where `a,b` are constants such that

A

`a=-1`, `b=3`

B

`theta=pi//4`

C

`a=3`, `b=-1`

D

`theta=(pi)/(3)`

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The correct Answer is:
B, C
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