Question

Помогите пожалуйста, срочно надо

Answer 1

$frac{Cosalpha }{1+Sinalpha } +frac{1+Sinalpha }{Cosalpha }=frac{Cos^{2}alpha+(1+Sinalpha)^{2}}{Cosalpha(1+Sinalpha)}=frac{Cos^{2}alpha+1+2Sinalpha+Sin^{2}alpha}{Cosalpha(1+Sinalpha)}=frac{1+1+2Sinalpha }{Cosalpha(1+Sinalpha)}=frac{2+2Sinalpha }{Cosalpha(1+Sinalpha)}=frac{2(1+Sinalpha )}{Cosalpha(1+Sinalpha)}=frac{2}{Cosalpha} =2secalpha$