1+tan^2 x = 1/cos^2 x

=> 1+ t^2 = 1/cos^2 x

=> 3 + 3t^2 = 3/cos^2 x

PT TRỞ THÀNH :

3 + 3t^2 - 2t + 1 = 0

<=> 3t^2 - 2t + 4 = 0

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