Question

sin альфа и tg альфа, если cos пльфа＝5/13.

Answer 1

$cos alpha = frac{5}{13} \ \ \ sin alpha = sqrt{1-cos^2 alpha }= sqrt{1-( frac{5}{13} )^2} = sqrt{1- frac{25}{169} }= sqrt{frac{144}{169} }= frac{12}{13} \ \ \ tg alpha = cfrac{sin alpha }{cos alpha }= cfrac{ frac{12}{13} }{ frac{5}{13} }= frac{12}{5}$