Euler's Formula and Euler's Identity (Lesson and Exercises)

Euler's formula, named after Leonhard Euler, is a mathematical formula in 

complex analysis that establishes the fundamental relationship between the 

trigonometric functions and the complex exponential function.

There is the solving Euler's Formula and Euler's identity..

Please do it following the step....

       OK we have the Euler's Formula above than we just instead x to pi(3.14)

Euler's identity

Thank you anyway 

From Robotics08.com.