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nhimeo31101999


Câu 1.$\dfrac{2(1+cot2x.cotx)}{sin^2x}+ \dfrac{1}{cos^4x} = 48$
Câu 2.$ \dfrac{4sinx.sin(x+\dfrac{\pi}{3})+ 5\sqrt{3}sinx +3(cosx+2)}{1-2cosx}=1$
Câu 2.$ \dfrac{4sinx.sin(x+\dfrac{\pi}{3})+ 5\sqrt{3}sinx +3(cosx+2)}{1-2cosx}=1$
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