Bài 29 (SBT trang 195)

Tính các giá trị lượng giác của cung \(\alpha\), biết :

a) \(\sin\alpha=0,6\) khi \(0< \alpha< \dfrac{\pi}{2}\)

b) \(\cos\alpha=-0,7\) khi \(\dfrac{\pi}{2}< \alpha< \pi\)

c) \(\tan\alpha=2\) khi \(\pi< \alpha< \dfrac{3\pi}{2}\)

d) \(\cot\alpha=-3\) khi \(\dfrac{3\pi}{2}< \alpha< 2\pi\)

Các câu hỏi liên quan

Tính nhanh

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