Question

задание номер 5
.............................

Answer 1

$sin2 alpha =2sin alpha cos alpha =2sin alpha sqrt{1-sin^2 alpha } =2* (-frac{3}{5}) sqrt{1- frac{9}{25} }=- frac{6}{10}* frac{4}{5} \ =- frac{24}{50}=- frac{12}{25}$