Question

cho sin a =7/25.Tìm cos a, tân á, cột a.

Answer 1

De mak ban

\(Cosa=\sqrt{1-Sin^2a}=.......\)

\(tga=\dfrac{sina}{cosa}=.....\)

\(cotg=\dfrac{cosa}{sina}=......\)

Answer 2

Ai là CTV xóa hộ câu trl bên dưới với

Answer 3

ta có : \(sin^2a+cos^2a=1\Leftrightarrow cos^2a=1-sin^2a=1-\left(\dfrac{7}{25}\right)^2=\dfrac{576}{625}\)

\(\Rightarrow cosa=\pm\dfrac{24}{25}\)

ta có : \(tana=\dfrac{sina}{cosa}=\dfrac{\dfrac{7}{25}}{\pm\dfrac{24}{25}}=\pm\dfrac{7}{24}\)

\(cota=\dfrac{1}{tana}=\pm\dfrac{24}{7}\)

vậy \(cosa=\pm\dfrac{24}{25};tana=\pm\dfrac{7}{24};cota=\pm\dfrac{24}{7}\)