znanija.com/task/37851466 ! Online Чтение
1) arcsin0,5 + arccos(-1) - arccos0- arctg1 =30° +180° -90° -45° = 75° ;
2) arcsin(√3/2)+arccos(-√2/2)- arccos(√3/2)-arcctg1
= 60°+135° -30°-45° =120° ;
3) arctg(√3)+arccos(√2/2)-arccos(-√3/2)-arcsin1
=60°+45°-150°-90° = - 135° ;
4)arcsin(-√3/2)+arccos(1/2) - arccos(0) - arcctg(-1)= - 60°+60°-90°-135° = - 225° .
= = = = = = = = = = = = = = = = = = = = =
* * * - 90° ≤ arcsin(a) ≤90° ; - 90° < arctg(a) < 90° ; 0° ≤ arccos(a) ≤180° ;
0° < arcctg(a) < 180° . || 180° = π/2 || * * *