Common Trigonometry Mistakes
Example: Value of inverse tangent |

Some problems provide the opportunity for more than one mistake. The Goal
Find:
The Mistakes
Find the mistakes:
(Roll the mouse over the math to see a hint in red) (Roll the mouse over the math to see a hint in red) The Correction
(Roll the mouse over the area above to see the correction in blue) Explanations
In the first mistake the notation tan
In the second mistake the answer was given in degrees without specifying that degree measure is intended. The inverse trigonometric functions are most usefully defined with the range in Using a calculator with the angle mode set to "degrees" may have been the source of the mistake. Students should know the values of the inverse trigonometric functions at nice values - visit Trigonometric Facts to help learn these values. |

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