若sin(x+3п)cos(x-п)=2a+1,求实数a的取值范围.
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若sin(x+3п)cos(x-п)=2a+1,求实数a的取值范围.
若sin(x+3п)cos(x-п)=2a+1,求实数a的取值范围.
若sin(x+3п)cos(x-п)=2a+1,求实数a的取值范围.
sin(x+3п)cos(x-п)=2a+1
sin(x+п)cos(п-x)=2a+1
-sinx(-cosx)=2a+1
2sinxcosx=4a+2
sin2x=4a+2
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若sin(x+3п)cos(x-п)=2a+1,求实数a的取值范围.
若sin(x+3п)cos(x-п)=2a+1,求实数a的取值范围.
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