Question

вычислить а）sin 120°, б）cos 135°, в）tg 150° , г）sin 150°, д）cos 120° ,е）tg 135°

Answer 1

а）sin120° =  sin(180° - 60°) = sin60° = √3/2

б）cos135° = cos(180° - 45°) = -cos45° = -√2/2

в）tg150° =  tg(180° - 30°) = -tg30° = -√3/3

г）sin150° = sin(180° - 30°) = sin30° = 1/2

д）cos120° = cos(180° - 60°) = -cos60° = -1/2

е）tg135° =  tg(180° - 45°) = -tg45° = -1