Chapter 7: Analytic Trigonometry
... Graphs of these functions may be found in the text. Note there are no keys on the TI-86 corresponding to the last three functions above. To find Sec–1(2), think sec(θ) = 2 = 1 / cos(θ) Thus you wish to find the angle θ such that cos(θ) = 1/2 or Cos–1(1/2) = 60°. •Example: Find Cos–1(–1/2). This shou ...
... Graphs of these functions may be found in the text. Note there are no keys on the TI-86 corresponding to the last three functions above. To find Sec–1(2), think sec(θ) = 2 = 1 / cos(θ) Thus you wish to find the angle θ such that cos(θ) = 1/2 or Cos–1(1/2) = 60°. •Example: Find Cos–1(–1/2). This shou ...