若tanα=2，则 2sinα−cosαsinα+2cosα 的值为_刷题宝

题干

若tanα=2，则 sincossincos

2

α

−

α

α

+

2

α

的值为（）

A：0

B： $\frac{3}{4}$

C：1

D： $\frac{5}{4}$

上一题下一题 0.0难度选择题更新时间:2014-03-25 11:46:39

答案(点此获取答案解析）

B

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