1. Derivatives of Sine, Cosine and Tangent
1. Derivatives of the Sine, Cosine and Tangent Functions by M. Bourne It can be shown from first principles that: `(d(sin\ x))/(dx)=cos\ x` `(d(cos\ x))/dx=-sin\ x` `(d(tan\ x))/(dx)=sec^2x` In words, we would say: The derivative of si...