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> 已知函数f（x）=2cos 2x+2sinxcosx-1的图象与g（x）=-1的图象在y轴的右侧交点按从横坐标由小到大的顺序记为D 1，D 2，D 3，…，则|D 5D 7|=（　　） A． 3π 2 B．π C．2π D． 5π 2

问题：

发布时间：2024-09-09

已知函数f（x）=2cos ²x+2sinxcosx-1的图象与g（x）=-1的图象在y轴的右侧交点按从横坐标由小到大的顺序记为D ₁，D ₂，D ₃，…，则|D ₅D ₇|=（　　）

A．

3π

2

B．π C．2π D．

5π

2

参考答案：

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已知函数f（x）=2cos 2x+2sinxcosx-1的图象与g（x）=-1的图象在y轴的右侧交点按从横坐标由小到大的顺序记为D 1，D 2，D 3，…，则|D 5D 7|=（ ） A． 3π 2 B．π C．2π D． 5π 2

可能感兴趣的题目：

已知函数f（x）=2cos ²x+2sinxcosx-1的图象与g（x）=-1的图象在y轴的右侧交点按从横坐标由小到大的顺序记为D ₁，D ₂，D ₃，…，则|D ₅D ₇|=（　　）

A．

3π

2

B．π C．2π D．

5π

2