How to use sum and difference of two angles to verify an identity

👉 Learn how to verify the sum and difference of two angles trigonometric identities using the sum/difference formulas. To verify an identity means to ascertain that the left-hand side is equal to the right-hand side of the equality sign. To do this, we first expand all the given sum/difference of two angles trigonometric functions and then use the unit circle and the Pythagoras theorem to obtain all the known angles. We can then simplify the expressions on both sides of the equality sign to ascertain that they are equal.

Organized Videos:
✅ Sum and Difference Formulas
✅ Evaluate Sum and Difference Formulas from a Triangle
✅ Simplify an Expression using Sum and Difference Formulas
✅ Write the Expression as a single function | Sum and Difference Formulas
✅ Verify Identities using Sum and Difference Identities
✅ Evaluate Tangent using Sum and Difference Formulas
✅ Evaluate Cosine using Sum and Difference Formulas
✅ Evaluate Sine using Sum and Difference of Two Angles
✅ Solve Equations using Sum and Difference Formulas

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[wristdisabledwriter]

That was fun to watch the simple proof

[fitwithgonz]

Excuse me, where did you get sin from? Or was that in a formula ?