Common Trigonometry Mistakes
Example: Value of inverse cosine
Find the mistake:
(Roll the mouse over the math to see a hint in red)
(Roll the mouse over the area above to see the correction in blue)
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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