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Learning to solve an equation by using the sum and difference formulas

429 views · Published 25 January 2014 · 5:09 · Indexed 23 September 2026

Channel: Brian McLogan · 2014 · Education

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👉 Learn how to solve equations using the angles sum and difference identities. Using the angles sum and difference identities, we are able to expand the trigonometric expressions, thereby obtaining the values of the non-variable terms. The variable terms are easily simplified by combining like terms and solving for x. To solve for x we will need to isolate the trigonometric functions and apply inverse trigonometric functions and the unit circle to solve. The appropriate range is applied to get the required value of x.

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Organized Videos:
✅ Sum and Difference Formulas
https://www.youtube.com/playlist?list=PL0G-Nd0V5ZModptYHwpZKF4wDnuLmUoCn
✅ Evaluate Sum and Difference Formulas from a Triangle
https://www.youtube.com/playlist?list=PL0G-Nd0V5ZMrYGCXxoHbj-53f-PPMigcD
✅ Simplify an Expression using Sum and Difference Formulas
https://www.youtube.com/playlist?list=PL0G-Nd0V5ZMrLOxnjPokBJ5ixvPLGQeFe
✅ Write the Expression as a single function | Sum and Difference Formulas
https://www.youtube.com/playlist?list=PL0G-Nd0V5ZMpaN-CjBrywDF3pwkK0wyIJ
✅ Verify Identities using Sum and Difference Identities
https://www.youtube.com/playlist?list=PL0G-Nd0V5ZMo8pki6ZB39Ht7YrskfdeHk
✅ Evaluate Tangent using Sum and Difference Formulas
https://www.youtube.com/playlist?list=PL0G-Nd0V5ZMqW82gHtq7LxLJF37KOPSRb
✅ Evaluate Cosine using Sum and Difference Formulas
https://www.youtube.com/playlist?list=PL0G-Nd0V5ZMqmSBX4k9m9ixWPC-74xr1X
✅ Evaluate Sine using Sum and Difference of Two Angles
https://www.youtube.com/playlist?list=PL0G-Nd0V5ZMoPJMGuSrPj8H3iioeVyfR3
✅ Solve Equations using Sum and Difference Formulas
https://www.youtube.com/playlist?list=PL0G-Nd0V5ZMoor9EhF5eP7QH1_o60yJ1l

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