Appendix A
Some Formulas and Identities
Here are some useful formulas and identities made use of but not introduced elsewhere in the book.
Euler's identity relating the exponential function to trigonometric functions:
(A.1)
(A.2)
(A.3)
Cosine and Sine Multiplication
(A.4)
(A.5)
(A.6)
(A.7)
Sum and Difference of Angles
(A.8)
(A.9)
Law of Cosines (applicable for any triangle) See Figure A.1.
(A.10)