已知tana/tan-1=-1,求sina-3cosa/sina+cosa 已知tana/tan-1=-1,求sina-3cosa/sina+cosa
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已知tana/tan-1=-1,求sina-3cosa/sina+cosa 已知tana/tan-1=-1,求sina-3cosa/sina+cosa
已知tana/tan-1=-1,求sina-3cosa/sina+cosa
已知tana/tan-1=-1,求sina-3cosa/sina+cosa
已知tana/tan-1=-1,求sina-3cosa/sina+cosa 已知tana/tan-1=-1,求sina-3cosa/sina+cosa