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tranhongnoc123
2 năm trước
giải phường trình sau a) $sin^{4}x$ + $cos^{4}x$ =sin2x.cos2x b) $sin^{6}x$ + $cos^{6}x$ = $\frac{5}{6}$ ($sin^{4}x$ + $cos^{4}x$ )
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