Toán Lớp 11: 1. 2sinx.cos2x+1+2cos2x+sinx=0
2. Sin^3x+cos^3x+1/√2 sin2x.sin(x+π/4)=cosx+sin3x
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Toán Lớp 11: 1. 2sinx.cos2x+1+2cos2x+sinx=0
2. Sin^3x+cos^3x+1/√2 sin2x.sin(x+π/4)=cosx+sin3x
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