Toán 11

N

nobeltheki21

Tl

[TEX] cos2x - cos2x.sin2x=24[/TEX]
*cos2x=0=>ptvn.
*cos2x#0.=> pt[TEX]<=> 1-tan2x-24tan^2 2x -24=0[/TEX]
dat tan2x=t.
. Tự làm tiếp nhé......................................................
 
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