Сравните a) sin60° и tg(-45°) б) cos60° и cos60°×ctg30° - вопрос №8624940604560603030230 от зузу10 09.02.2020 07:43

Question

Алгебра: Сравните a) sin60° и tg(-45°) б) cos60° и cos60°×ctg30° в) sin30° и sin^2_30°

зузу10 · Answer

А)sin60° и tg(-45°)sin60°=tg(-45°)= tg135°=-1sin60° tg(-45°)б) cos60° и cos60°×ctg30°cos60°=cos60°×ctg30°=*=cos60° cos60°×ctg30°в) sin30° и sin²30°sin30°=sin²30°=sin30°*sin30°=*=sin30° sin²30°...