Упростите выражение 1-〖cos〗^2 α) / (〖sin〗^2 α)+1/ (〖sin〗^2 α*

(1-cos^2 α) / (sin^2 α)+1/ (sin^2 α*(1+tg^2 α) 1-cos^2 α=sin^2α1+tg^2 α=1/ (cos^2a) (1-cos^2 α) / (sin^2 α)+1/ (sin^2 α*(1+tg^2 α)=sin^2α/ (sin^2 α)+1/ (sin^2 α*(1/cos^2a)=1+cos^2a/sin^2 α=1+ctg^2a=1/sin^2 a