Question

Найдите sin a+cos a если sin a*cos a=0,2

Answer 1

$sin(\alpha)+cos(\alpha)\mid(^{2}) \\ \\ sin(\alpha)^{2}+2*cos(\alpha)*sin(\alpha)+cos(\alpha)^{2} \\ \\ 1+2*sin(\alpha)*cos(\alpha) \\ \\ 1+2*0,2=1,4$