Precalculus Course
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
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
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
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
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
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
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
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
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 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
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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