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College Algebra covers algebraic topics and skills necessary to succeed in college-level math

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Kylia

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Study topics incliding trogonometric functions, identities and equations, solutions of triangles, complex numbers, and other topics as time permits

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Learn the toughest concepts covered in Precalculus with step-by-step video tutorials and practice problems by world-class tutors

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Nick

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Dive deep into Python with videos and more.

Introduction to Python

Arianne Dee

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Mariya Breyther

Introduction to Microsoft Power BI

Microsoft Power BI

Chris Sorensen

Data Analysis Fundamentals with Excel

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Chris Sorensen & Ammul Shergill

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George Levy

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Lee Donahoe & Michael Hartl

Learn Enough JavaScript to be Dangerous: A Tutorial Introduction to Programming with JavaScript

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Michael Hartl

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Jared P. Lander

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Mike Moran

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Jeffrey K. Pinto

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Need a solid foundation before calculus? Precalculus concepts like functions, sequences, and limits are clarified to prepare you for success.

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Patrick Ford

0. Fundamental Concepts of Algebra

1. Equations and Inequalities

2. Graphs

3. Functions & Graphs

4. Polynomial Functions

5. Rational Functions

6. Exponential and Logarithmic Functions

7. Measuring Angles

8. Trigonometric Functions on Right Triangles

9. Unit Circle

10. Graphing Trigonometric Functions

11. Inverse Trigonometric Functions and Basic Trig Equations

12. Trigonometric Identities 

13. Non-Right Triangles

14. Vectors

15. Polar Equations

16. Parametric Equations

17. Graphing Complex Numbers

18. Systems of Equations and Matrices

19. Conic Sections

20. Sequences, Series & Induction

21. Combinatorics and Probability

22. Limits & Continuity

23. Intro to Derivatives & Area Under the Curve

Default TOC

Inverse Sine, Cosine, & Tangent

Evaluate Composite Trig Functions

Linear Trigonometric Equations

Introduction to Trigonometric Identities

Sum and Difference Identities

Double Angle Identities

Solving Trigonometric Equations Using Identities

Law of Sines

Law of Cosines

Area of SAS & ASA Triangles

Geometric Vectors

Vectors in Component Form

Direction of a Vector

Unit Vectors and i & j Notation

Dot Product

Cross Product

Polar Coordinate System

Convert Points Between Polar and Rectangular Coordinates

Convert Equations Between Polar and Rectangular Forms

Graphing Other Common Polar Equations

Graphing Parametric Equations

Eliminate the Parameter

Writing Parametric Equations

Graphing Complex Numbers

Polar Form of Complex Numbers

Precalculus Final - Part 1 of 2

Is the given equation an identity?cot2xcos2x=cot2x+sin2x−1\cot^2x\cos^2x=\cot^2x+\sin^2x-1cot2xcos2x=cot2x+sin2x−1

Is the given equation an identity?
$\cot^2x\cos^2x=\cot^2x+\sin^2x-1$