Question

* Cho tam giác ABC vuông tại C. Biết cosA=\(\dfrac{5}{13}\). Tính tan B

Answer 1

Answer 2

\(\sin\widehat{A}=\sqrt{1-\left(\dfrac{5}{13}\right)^2}=\dfrac{12}{13}\)

\(\cot\widehat{A}=\dfrac{5}{13}:\dfrac{12}{13}=\dfrac{5}{12}\)

\(\tan\widehat{B}=\dfrac{5}{12}\)