Question 1034537
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Find each value. Write angle measures in radians. 


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13. Cos^-1(- square root of 3/2)         arccos({{{-sqrt(3)/2}}}) = {{{5pi/6}}}.
 
14. Sin^-1 (-squareroot of 2/2)          arcsin({{{-sqrt(2)/2}}}) = {{{-pi/4}}}.


15. Arctan (-squareroot of 3/3)          arctan(({{{-sqrt(3)/3}}}) = {{{-pi/6}}}.

16. tan (Cos^-1 1/2)                     tan(arccos({{{1/2}}}) = tan({{{pi/3}}}) = {{{sqrt(3)}}}.

17. cos (sin^-1 (-3/5))                  {{{4/5}}}.

18. cos (Arctan (-1))                    cos(arctan(-1)) = cos({{{-pi/4}}}) = {{{sqrt(2)/2}}}.

19. tan (sin^-1 12/13)                   {{{12/5}}}.

20. sin (Arctan -squareroot 3/3)         sin(arctan({{{-sqrt(3)/3}}}) = sin({{{-pi/6}}}) = {{{-1/2}}}.

21. Cos^-1 (tan 3pi/4)                   arccos(tan({{{3pi/4}}}) = arccos(-1) = {{{pi}}}.

22. Sin^-1 (cos(pi/ 3))                  arcsin(cos{{{pi/3}}}) = arcsin({{{1/2}}}) = {{{pi/6}}}.
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