"Do not worry about your difficulties in mathematics, I assure you that mine are greater" - Albert Einstein ( 1879 - 1955 )
Integration By Parts

Natural Logarithm, ln x



§ Some implications for natural logs:

§ Properties of ln:

The Inverse of ln x and the number e

§ Definition of number e:

§ Number e defined numerically:

§ Properties of ln x and e:

§ Laws of exponents for ex:

The calculus for ln x and ex

The Hyperbolic Function
Every function that is defined on an interval centered at the origin is comprised of even and odd components as follows:

The importance of this class of functions lies in the fact that they best describe the hanging catenary shapes of electrical powerline cables, wave motion in certain elastic solids, and are involved in the differential equations for heat transfer in metals, as well as demonstrating time and distance dilations in special relativity mathematics.
§ Derived hyperbolic identities:

§ The derivatives for these hyperbolic functions:

Maclaurin Series for Some Trig Functions

§ Small trignometric approximations:

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