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Toán Lớp 11: Sin(2x-15°)=√3/2 2sin3x=-√3 Sin(x/2+pi/4)=-1/2 mn giúp mình với

Home/ Toán Lớp 11: Sin(2x-15°)=√3/2 2sin3x=-√3 Sin(x/2+pi/4)=-1/2 mn giúp mình với

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