Gaokao Math Practice Question
10.曲线 $y=2 \sin x+\cos x$ 在点 $(\pi,-1)$ 处的切线方程为
- A.$x-y-\pi-1=0$
- B.$2 x-y-2 \pi-1=0$
- C.$2 x+y-2 \pi+1=0$
- D.$x+y-\pi+1=0$
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