已知tanα=2，则的值为（）A．  B．- 

已知tanα=2，则的值为（）

A．  B．- C．  D．或



答案

解析：原式====.

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已知tanα=2，则的值为（ ）A．  B．- 

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已知tanα=2，则的值为（）A．  B．- 