прикрепила.........2 номера
Tg270=---
sin(90-80)cos(360+50)-sin(1620+80)sin50/sin(90-70)sin(360+40)+sin70cos(540-40)=cos80cos50-sin80sin50/cos70sin40+sin70cos40=cos(80+50)/sin(70+40)=cos120/sin110=-0.5/sin110
Нет такого!!!!!!!!!!!!!!!!
44cos2a = 44(cos²a - sin² a) = 44(1 - sin²a - sin²a) = 44(1 - 2sin²a) = 44 - 88sin²a = 44 - 88*(-0,3)² = 44 - 88*0,09 = 44 - 7,92 = 36,08