sin(π-α)-cos（π+α）=根号2/3（π/2

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sin(π-α)-cos（π+α）=根号2/3（π/2
sin(π-α)-cos（π+α）=根号2/3（π/2

sin(π-α)-cos（π+α）=根号2/3（π/2
sin(π-α)-cos（π+α)=sinα+cosα=√2/3,（π/2