INVERSE TRIG FUNCTIONS Evaluating (Page 7 of 10)

Next, let's find an angle whose secant is -2.  Use the inverse of the reciprocal function (the cosine) and enter the argument followed by the x to the -1 key. key.

 CLEAR key.

 2nd inverse cosine key. Negation key. 2 x to the -1 key. Right parenthesis key. ENTER key.

 Calculator screen image.

As shown, the angle is 120°.

The arccosecant  function will only return an angle between -90° and 90° (inclusive, excluding zero), the arcsecant an angle between 0 and 180° (inclusive, excluding 90°), and the arccotangent an angle between -90° and 90° (excluding zero). Be aware that the range for these functions as defined by the calculator may differ from the range specified in your text book.
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