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T
2sinx(1+cos2x)+sin2x=1+2cosx
sin2x-cos2x+3sinx-cosx-1=0
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T
1: cos3x+cos2x-cosx-1=0
2: 2sinx(1+cos2x)+sin2x=1+2cosx
3: sin2x-cos2x+3sinx-cosx-1=0
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T
1: sin2x+2cos2x=1+sinx-4cosx
2: sin2x-cos2x=3sinx+cosx-2