Cho sin anpha = 3/5. Tính cos anpha, tan anpha, cot anpha

* Hướng dẫn giải

$\sin \alpha =\frac{3}{5}\Rightarrow \cos \alpha =\sqrt{1-{\sin }^2\alpha }=\sqrt{1-\left(\frac{3}{5}\right)}=\frac{4}{5}$

$\tan \alpha =\frac{\sin \alpha }{\cos \alpha }=\frac{\frac{3}{5}}{\frac{4}{5}}=\frac{3}{4};\cot \alpha =\frac{1}{\tan \alpha }=\frac{4}{3}$