Common Trigonometry Mistakes
Example: Simplifying a trigonometric expression
Some problems provide the opportunity for more than one mistake.
Simplify the expression:
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)
(Roll the mouse over the area above to see the correction in blue)
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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