Precalculus Course

freeCodeCamp.org

freeCodeCamp.org

322 min, 2 sec

A detailed look at trigonometry concepts, theorems, and parametric equations.

Summary

  • Trigonometry functions like sine, cosine, and tangent are explored, including their relationships and graphs.
  • Concepts such as the unit circle, parametric equations, and polar coordinates are explained.
  • Theorems like the Pythagorean identity, Law of Sines, and Law of Cosines are elucidated with proofs and examples.
  • Conversions between polar and Cartesian coordinates are demonstrated.
  • Parametric equations are introduced as an alternative to Cartesian equations for graphing curves.

Chapter 1

Trigonometry Functions and Definitions

240:00 - 63 min, 20 sec

Introduction to basic trigonometry functions and their properties.

Introduction to basic trigonometry functions and their properties.

  • Trigonometry functions such as sine, cosine, and tangent are defined using right triangles and the unit circle.
  • Special angles (30, 45, 60 degrees) and their sine and cosine values are calculated.
  • The concepts of domain, range, periodicity, and symmetry for sine and cosine functions are explained.

Chapter 2

Inverse Trigonometry Functions

303:20 - 60 min, 0 sec

Explanation of inverse trigonometry functions and their usage.

  • Inverse trigonometry functions like arcsine, arccosine, and arctangent are introduced.
  • The domain and range for each inverse function are provided.
  • Examples of finding angles using inverse trigonometry functions are demonstrated.

Chapter 3

Angle Sum and Double Angle Formulas

363:20 - 60 min, 0 sec

Derivation and application of angle sum and double angle formulas.

  • Angle sum formulas for sine and cosine are stated and proved geometrically.
  • Double angle formulas for sine and cosine are derived and examples are provided.
  • Use of these formulas to solve trigonometry problems is illustrated.

Chapter 4

Half Angle Formulas and Their Applications

423:20 - 60 min, 0 sec

Introduction to half angle formulas and their practical use cases.

  • Half angle formulas for sine and cosine are provided.
  • A step-by-step guide on using these formulas to find sine and cosine of half angles.
  • An example using the half angle formulas to find exact trigonometry values.

Chapter 5

Solving Right Triangles

483:20 - 60 min, 0 sec

Techniques for solving right triangles using trigonometry.

  • Methods for finding missing side lengths and angles in right triangles are covered.
  • Use of trigonometric ratios and the Pythagorean Theorem in solving triangles is explained.
  • Examples of solving right triangles with different given information.

Chapter 6

Law of Cosines and Non-Right Triangles

543:20 - 60 min, 0 sec

Explanation of the Law of Cosines and its application to non-right triangles.

  • The Law of Cosines is explained as a generalization of the Pythagorean Theorem.
  • Examples demonstrate solving for sides and angles of non-right triangles using the Law of Cosines.
  • Different forms of the Law of Cosines are presented based on the known elements of the triangle.

Chapter 7

Law of Sines and its Applications

603:20 - 60 min, 0 sec

The Law of Sines is discussed with examples showing how to solve for unknown triangle measures.

  • The Law of Sines is described for finding measures in any triangle.
  • Examples showing the use of the Law of Sines to solve for angles and sides.
  • The ambiguous case of SSA triangles is addressed with examples.

Chapter 8

Parametric Equations and Conversions

663:20 - 60 min, 0 sec

Overview of parametric equations and converting between coordinate systems.

  • Parametric equations are introduced as a way to describe curves that fail the vertical line test.
  • Conversion between parametric and Cartesian equations is explained with examples.
  • Equations of circles are represented both parametrically and in Cartesian form.

Chapter 9

Conic Sections: Parabolas and Ellipses

723:20 - 60 min, 0 sec

Conic sections including parabolas and ellipses are explored with their equations.

  • The definition and equation of a parabola are explained with focus and directrix.
  • Ellipses are defined with their major and minor axes, vertices, and foci.
  • Equations for parabolas and ellipses with shifted vertices are provided.

Chapter 10

Hyperbolas and their Properties

783:20 - 60 min, 0 sec

An introduction to hyperbolas, their features, and equations.

  • Hyperbolas are defined as the set of points with a constant difference in distance from two foci.
  • Vertices, center, and asymptotes of hyperbolas are discussed.
  • Equations for hyperbolas with horizontal and vertical orientations are provided.

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