Common Trigonometry Mistakes
Example: Simplifying a trigonometric expression 
Some problems provide the opportunity for more than one mistake. The Goal
Simplify the expression:
The Mistakes
Find the mistakes:
(Roll the mouse over the math to see hints in red) (Roll the mouse over the math to see hints in red and green) The Correction
(Roll the mouse over the area above to see the correction in blue) Explanations
The first attempted solution has two mistakes; in the second step the second fraction's numerator should have had all terms multiplied by sin(x). In the third step the minus sign was not distributed correctly. 
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