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ks.theluc
2 năm trước
Giải phương trình: a) 3tan2x+2cos2x= $\frac{3}{cos2x}$+2tan(x- $\pi$/4) b) $sin^{2}$x+ $sin^{2}$2x+ $sin^{2}$3x= $\frac{3}{2}$
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