# Algebra in plain view

## Chapter 1. Sequence

• Lesson 1.
• Sequence.1.A (pdf)
• Arithmetic / Geometric / Harmonic Mean
• Arithmetic / Geometric / Harmonic Progression
• Sequence.1.B. (pdf)
• Arithmetic Progression Examples
• Geometric Progression Examples
• Harmonic Progression Examples
• Partial Sum and Area

• Lesson 2.
• Sequence.2.A (pdf)
• Summation Notation
• Flow Chart
• Partial Sum of A.P.
• Partial Sum of G.P.

• Lesson 3.
• Sequence.3.A (pdf)
• Partial Sum Sequence
• Difference Sequence
• Summation of k2, k3, k4

• Lesson 4.
• Sequence.4.A (pdf)
• Closed Form Expression
• Recurrence Expression
• Mathematical Induction

## Chapter 2. Trigonometry

• Lesson 1.
• Trigonometry.1.A (pdf)
• Angles in Degree
• Conversion between Degree and Radian
• Co-terminal Angles

• Lesson 2.
• Trigonometry.2.A (pdf)
• Sine Law - all acute angles
• Cosine Law - all acute angles
• Sine Law - one obtuse angle
• Cosine Law - one obtuse angle

• Lesson 3.
• Trigonometry.3.A (pdf)
• Negative Angle Trigonometry
• Reference Angle Trigonometry
• Sinusoidal Waves

• Lesson 4.
• Trigonometry.4.A (pdf)
• Trigonometric Identities

## Chapter 3. Exponential and Logarithmic Functions

• Logarithm.1.A (pdf)

## Miscellaneous

• Histogram
• Histogram.1.A (pdf)
• Lines and Planes
• Geometry.1.A (pdf)
• Translations
• Translations.1.A (pdf)
• Speed, Distance, Time
• Speed.1.A (in Korean) (pdf)
• Percent and Proportion
• Percent.1.A (in Korean) (pdf)
• Round-off
• Round.1.A (in Korean) (pdf)