Gaokao Math Practice Question
7. (5 分) 已知角 $\theta$ 的顶点与原点重合, 始边与 $\mathrm{x}$ 轴的正半轴重合, 终边在直 线 $y=2 x$ 上, 则 $\cos 2 \theta=(\quad)$
- A.$-\frac{4}{5}$
- B.$-\frac{3}{5}$
- C.$\frac{3}{5}$
- D.$\frac{4}{5}$
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