Common Trigonometry Mistakes
Example: Value of inverse cosine 
The Goal
Find
The Mistake
Find the mistake: (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) An Explanation The range for inverse cosine is the interval from 0 to π. Cosine takes on negative values between π/2 and π. Students should learn the values of the inverse trigonometric functions at nice values  visit Trigonometric Facts to help learn these values. 
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