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

If `x=X cos theta- Y sin theta, y= X sin theta+ Y cos theta and x^(2)+4xy+y^(2)=AX^(2), B^(2),"for " 0 le theta le (pi)/(2)` then (A,B)=

A

(-3,-1)

B

(-3,1)

C

(3,-1)

D

(3,1)

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The correct Answer is:
C
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