Question

Дано:sin альфа=3/5;pi/2<альфа РЕШИТЕ ПЛИИИЗ!!!!

Answer 1

$Cos alpha =- sqrt{1-Sin ^{2} alpha } = - sqrt{1-( frac{3}{5}) ^{2} }=- sqrt{1- frac{9}{25} }=- sqrt{ frac{16}{25} }=- frac{4}{5}$
$tg alpha = frac{Sin alpha }{Cos alpha } = frac{ frac{3}{5} }{- frac{4}{5} }=- frac{3}{5}* frac{5}{4} =- frac{3}{4}$
$Ctg alpha = frac{1}{tg alpha }= frac{1}{- frac{3}{4} } = - frac{4}{3}= - 1 frac{1}{3}$