Question

cho góc nhọn alpha , nếu sin a =2/3 thì tan a =?

Answer 1

\(1+cot^2a=\dfrac{1}{sin^2a}=1:\dfrac{4}{9}=\dfrac{9}{4}\)

=>cot²a=5/4

=>cota=căn 5/2

=>tan a=2/căn 5

Answer 2

Có: \(Sin\alpha=\dfrac{2}{3}\Leftrightarrow\alpha=41^o48'37,13''\)

\(\Rightarrow tan\alpha\approx0,8944\)