1.

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)=

Answer»

(-3,-1)
(-3,1)
(3,-1)
(3,1)

ANSWER :C


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