Question 691289
Use a calculator to find all solutions in the interval (0, 2π). Round the answers to two decimal places. (Enter your answers as a comma-separated list. If there is no solution, enter NO SOLUTION.)
sec t = 7.38
  Hint: The equation is equivalent to 
cos t = 1/(7.38).
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Thx for the hint.
Use a calculator, get invcos(1/7.38)