#set math.equation(numbering:"1")

//useful equations and notes
= Appendix
+ Taylor expansion:
  $ 
      lr(f(x)|)_0 approx f(a) + f'(a)(x-a) + f''(a)(x-a)^2/2
  $
+ small angle approximation:
  $ 
      sin(theta) approx theta quad
      cos(theta) approx 1-theta^2/2  
  $ 
  