Chứng minh rằng:
\(\sqrt{\dfrac{1+cos\alpha}{1-cos\alpha}}-\sqrt{\dfrac{1-cos\alpha}{1+cos\alpha}}=2cot\alpha\left(0< \alpha< \dfrac{\pi}{2}\right)\).
Loga
Toán lớp 10
Chứng minh rằng:
\(\sqrt{\dfrac{1+cos\alpha}{1-cos\alpha}}-\sqrt{\dfrac{1-cos\alpha}{1+cos\alpha}}=2cot\alpha\left(0< \alpha< \dfrac{\pi}{2}\right)\).
