Question

sinα = -0.7, если 3Π:2<α<2Π. Найти: cosα, tgα, ctgα

Answer 1

$sinalpha=-0,7;frac{3pi}{2} textless alpha textless 2pi= textgreater alphain IV\cosalpha=sqrt{1-0,49}=sqrt{0,51}approx0,71\tgalpha=frac{sinalpha}{cosalpha}=frac{-0,7}{sqrt{0,51}}approx-0,98\ctgx=frac{1}{-0,98}approx-1,02}$