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chidau_yeuanhdau


1,
$2sinx.tanx + cosx -2tan x = 2sin^2 (\dfrac{x}{2} -\dfrac{\pi}{4} )$
2,
$(sinx +3). sin^4\dfrac{x}{2}- (sinx +3). sin^2\dfrac{x}{2}+1 = 0$
$2sinx.tanx + cosx -2tan x = 2sin^2 (\dfrac{x}{2} -\dfrac{\pi}{4} )$
2,
$(sinx +3). sin^4\dfrac{x}{2}- (sinx +3). sin^2\dfrac{x}{2}+1 = 0$
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