# Calculus of Trigonometry

- Author:
- Marius Sandu, John Golden

- Topic:
- Calculus, Cosine, Derivative, Sine, Trigonometry

From conversations with Sue VanHattum about deriving the derivative of sine or cosine with infinitesimals. See:
http://thephysicsvirtuosi.com/posts/trigonometric-derivatives.html
Adjust point B to change d(alpha), the change in angle alpha. Compare the change in sine and cosine to the change in angle. As B gets closer, do the approximations get better?

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