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MathAngel369
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MathAngel369

Learn Trigonometry, Calculus I, II, III, Linear Algebra, and Advanced Linear Algebra! MathAngel369 is an educational mathematics resource created by Angela Morgan to make learning mathematics accessible to everyone. Choose the learning method that works best for you: YouTube videos, blog discussions, or step-by-step math lessons!

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Category: Proving/Verifying and Using Trig Identities

This course is all about Proving/Verifying and Using Trig Identities.

Upon completing this course, you will understand how to prove the Reciprocal and Quotient Identities, Odd and Even Identities, Cofunction Identities, Pythagorean Identities, Sum and Difference Formulas, Double-Angle Identities, Power Reducing Identities, Half-Angle Identities, Product-to-Sum Formulas, and Sum-to-Product Formulas.

You will be able to use the above identities to verify other trig Identities, rewrite trig expressions, find the value of trig expressions, and solve trig equations.

Finally, you will understand how to prove that a trig equation is NOT an identity.

Posted on November 10, 2021October 26, 2026

Deriving the Sum and Difference Formulas for Sine and Cosine

Posted on October 31, 2021February 10, 2022

Verifying Trig Identities Using the Pythagorean Identities, Hard

Posted on October 26, 2021February 10, 2022

Verifying Trig Identities Using the Fundamental Trig Identities

Posted on October 12, 2021February 10, 2022

Simplifying Trigonometric Expressions Using the Pythagorean Trig Identities

Posted on October 3, 2021February 10, 2022

Proving the Pythagorean Trig Identities

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  • Choose a Math Topic
    • Trigonometry
      • Graphing Trig Functions
      • Inverse Trig Functions
      • Trig Identities
    • Calculus 1
    • Calculus 2
    • Calculus 3
    • Linear Algebra
    • Advanced Linear Algebra
    • Intro to Real Analysis
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