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Addition and Subtraction Formulas




 

Videos and lessons to help High School students learn how to prove the addition and subtraction formulas for sine, cosine, and tangent and use them to solve problems.



Common Core: HSF-TF.C.9

Related Topics:
Common Core (Functions)

Common Core for Mathematics

Trig Identities Sine Addition and Subtraction
Proof of the Sine angle sum/difference identity.


Trig Identities Cosine Addition and Subtraction
Proof of the Cosine angle sum/difference identity.





Trig Identities Tangent and using the identities
Proof of the Tangent angle sum/difference identity.


Trig Identities
The fundamental trig identities and some strategies for solving beginning general trigonometric identities.



 

Sum and Difference Identities for Sine
Use the sum and difference sine identity to determine function values.


Sum and Difference Identities for Cosine
Use the sum and difference cosine identity to determine function values.




Sum and Difference Identities for Tangent
Use the sum and difference tangent identity to determine function values.


Cosine addition identity example.



 

Rotate to landscape screen format on a mobile phone or small tablet to use the Mathway widget which allows your to practice solving Algebra, Trigonometry, Calculus and other math topics.


You can use the Mathway widget below to practice Trigonometry or other math topics. Try the given examples, or type in your own problem. Then click "Answer" to check your answer.


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