Question

Сроочнноо!!
tga=4/5   sina+cosa/sina-cosa=?

Answer 1

$frac{sin alpha +cos alpha }{sin alpha -cos alpha } = frac{ frac{sin alpha }{sin alpha }+ frac{cos alpha }{sin alpha } }{ frac{sin alpha }{sin alpha }- frac{cos alpha }{sin alpha } }= frac{1+ctg alpha }{1-ctg alpha } = frac{1+ frac{5}{4} }{1- frac{5}{4} }= frac{2 frac{1}{4} }{- frac{1}{4} }=-9$