Common Trigonometry Mistakes
Example: Value of inverse cosine

The Goal

Find

goal


The Mistake

Find the mistake:

mistake

(Roll the mouse over the math to see a hint in red)


The Correction

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.

Home Page | Common Trigonometry Mistakes | Privacy Policy

Valid HTML 4.01 Transitional

Affiliate