1.  Determine the principal angle(s) for x in each of the following situations (rounded to the nearest tenth of a degree):

 

a)  sin x = -0.3121

b)  cos x = 0.4107

c)  tan x = -0.2151

 

                  Answers (approximate, in degrees): a)  198.2, 341.8    b)  65.8, 294.2    c)  167.9, 347.9                 

 

                  Video Solution to a, b and c