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 a hint in red)
(Roll the mouse over the math to see a hint in red)
(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) Explanations
In the first mistake it appears that sin(2x) was interpreted as sin(x)sin(x), which is false; likewise for cos(2x). Sin(x) and cos(x) were then cancelled. The second step makes no sense, but perhaps was motivated by the expected answer (sec(x)). |

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