T
thuthuonglc007


$4\sin x + 3\cos x = 4(1+\tan x) - \dfrac{ 1}{cos x}$
Gõ $\LaTeX$ nhé
http://diendan.hocmai.vn/showthread.php?t=247845
Gõ $\LaTeX$ nhé
http://diendan.hocmai.vn/showthread.php?t=247845
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