OML Search

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.




 
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, a free math problem solver that answers your questions with step-by-step explanations.


You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.


OML Search


We welcome your feedback, comments and questions about this site or page. Please submit your feedback or enquiries via our Feedback page.


[?] Subscribe To This Site

XML RSS
follow us in feedly
Add to My Yahoo!
Add to My MSN
Subscribe with Bloglines