Ответ:

1)arcsin 0 =0

2)arccos 1= 0 ;

3)arcsin√2/2 =π/4 ;

4)arccos 3  не  существует угол косинус которой =3 ;

5)arcsin (-1) = -π/2 ;

6)arccos(-√3/2) = π -π/6 = 5π/6 ;

7)arctg 0 = 0 ;

8)arctg 1 =π/4 ;

9)arctg(-√3) = - π/3 ;

10)arcctg(-√3/3) = π -π/3= 2π/3 ;

11)arcsin(-1/2)+arccos 1 = -π/6 +0 = -π/6 ;

12) (arcsin -1)/2+ arccos 1 = -π/4+0= -π/4;

13)cos ( arccos 1) =1;

14)sin(arcsin√2/2) =√2/2 ;

15)arcsin (sin π/4) =arcsin(√2/2) =π/4 ;

16)arccos ( cos(-π/4))=arccos ( cos(π/4))=arccos (√2/2))=π/4 ;

 17)cos (arcsin(-1/3))=cos(arccos(√8/3)= √8/3 =2√2/3 ;

18)tg(arccos(-1/4)) =tq(arctq(-√15) = - √15;   1+tq²α= 1/cos²α

19)sin(arcctg(-2)) =sin(arcsin(1/√5)=1/√5 ;

20) arcsin(cos π/9) =arcsin(sin(π/2 - π/9))=arcsin(sin7π/18) =7π/18 .

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Объяснение: