Common Calculus Mistakes
Chain Rule: Trigonometric Functions |

The Goal
Find
The Mistake
Find the mistake: (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) An Explanation The chain rule was used incorrectly on cos(2x). The chain rule says:
For cos(2x) the outside function is f(x) = cos(x) and the inside function is g(x) = 2x. The inside function g(x) is composed with (plugged into) the derivative f'(x). The g'(x) = 2 part of the chain rule was performed correctly. |

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