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Toán Lớp 11: cos(2x – π/6) + cosx = 0 cos( π/3 – 2x) = sin(x + π/6) Giúp mình iii

Home/ Toán Lớp 11: cos(2x – π/6) + cosx = 0 cos( π/3 – 2x) = sin(x + π/6) Giúp mình iii

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