若tanα＝3，则2sinαcosα1?sin2α的值为（ ）A．2B．3C．4D．
若tanα＝3，则2sinαcosα1?sin2α的值为（ ）A．2B．3C．4D．6
推荐回答（1个）
∵tanα=3，
∴原式===2tanα=6．
故选D
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