How to apply the sum of angles with the sine of an angle not on unit circle

👉 Learn how to evaluate the secant of the sum or difference of two angles using the sum/difference formulas. To do this, we first use the Pythagoras theorem to obtain all the sides of the right triangle in the unit circle. Recall that secant is the reciprocal of cosine, so when we know the trigonometric function values of the two angles to be added or subtracted, we can apply the sum and difference formulas of cosine to evaluate the cosine of the sum and the difference of the two angles and then take their reciprocals.

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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