2.1 Powers, logs, exponentials
  2.1.1 Powers
  2.1.2 The product of two powers
  2.1.3 Exponential Function
  2.1.4 The Logarithmic Function
 2.2 Trigonometric functions
  2.2.1 Trigonometric identities
  2.2.2 Inverse Trig Functions
 2.3 Polar Coordinates
  2.3.1 Polar curves