Question

Sina= -2/3
Tga= ?
Ctga=?

Answer 1

$sin alpha =- frac{2}{3} \ cos alpha = sqrt{1-sin^2 alpha } \ cos alpha =+- sqrt{5} /3\ tg alpha = frac{sin alpha }{cos alpha } \ tg alpha =+-2/ sqrt{5}\ ctg alpha =+- sqrt{5} /2$