Purchase Solution

# Moivre-Laplace Formula

Not what you're looking for?

Moivre-Laplace formula
exp(ix) = cos(x) + i sin(x),
where i = (-1)^(1/2) , and which is widely used in different items of mathematics is usually deduced from the Maclaurin expansions of the functions involved.
But the theory of Taylor (Maclaurin) expansions is a part of more general theory developed in the course of the functions of complex variable. As the Moivre-Laplace formula has numerous applications outside this theory, it seems reasonable to deduce it without references to Maclaurin series.

Problem.

To prove the Moivre-Laplace formula: exp(ix) = cos(x) + i sin(x) without use of the Maclaurin expansions.

##### Solution Summary

The Moivre-Laplace Formula is prven without the use of Maclaurin expansions.

##### Solution Preview

Please see the attached file for the complete solution.
Thanks for using BrainMass.

Solution

Moivre-Laplace formula
e ix = cos(x) + i sin(x),

where i = , and which is widely used in different items of mathematics is usually deduced from the Maclaurin expansions of the functions involved:

cos(x) = ; sin(x) = .
As -1 = i2 , we have:

cos(x) + i sin(x) = + and the sum of these two series can obviously be written as a single series

= ,

and the latter series is just the Maclaurin expansion of e ix .
But the theory of Taylor (Maclaurin) expansions is a part of more general ...

##### Multiplying Complex Numbers

This is a short quiz to check your understanding of multiplication of complex numbers in rectangular form.

##### Geometry - Real Life Application Problems

Understanding of how geometry applies to in real-world contexts