Trigonometry/Derivative of Cosine
To find the derivative of .
- .
As in the proof of Derivative of Sine, the limit of the first term is and the limit of the second term is 1. Thus
- .
Thus
and so on for ever.
To find the derivative of .
As in the proof of Derivative of Sine, the limit of the first term is and the limit of the second term is 1. Thus
Thus
and so on for ever.