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> 已知角α的顶点与原点重合，始边与x轴的正半轴重合，终边在直线y= 1 3 x上，则sin 2α+sinαcosα的值（　　） A． 2 5 B．- 2 5 C．-2 D．2

问题：

发布时间：2024-09-09

已知角α的顶点与原点重合，始边与x轴的正半轴重合，终边在直线y=

1

3

x上，则sin ²α+sinαcosα的值（　　）

A．

2

5

B．-

2

5

C．-2 D．2

参考答案：

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已知角α的顶点与原点重合，始边与x轴的正半轴重合，终边在直线y= 1 3 x上，则sin 2α+sinαcosα的值（ ） A． 2 5 B．- 2 5 C．-2 D．2

可能感兴趣的题目：

已知角α的顶点与原点重合，始边与x轴的正半轴重合，终边在直线y=

1

3

x上，则sin ²α+sinαcosα的值（　　）

A．

2

5

B．-

2

5

C．-2 D．2