(sin^2 x- 2)/ (sin^2 2x -4cos^2 x)= tan^2 x ……giải pt
(sin^2 x- 2)/ (sin^2 2x -4cos^2 x)= tan^2 x ……giải pt
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(sin^2 x- 2)/ (sin^2 2x -4cos^2 x)= tan^2 x ……giải pt