6. Analytic Trigonometry

Formula for the cosine and the difference of two angles

Sum and Difference Formulas

How to evaluate the difference of two angles for cosine function

Sum and Difference Identities for Sine and Cosine, More Examples #2

Identities for Sum and Differences of Sine and Cosine, Example 3

Using the Sum and Difference Identities for Sine, Cosine and Tangent, Ex 1

Cosine of the Difference of Two Angles

Tangent Sum and Difference Formulas How to Use

Sum and Difference Identities for Sine and Cosine, More Examples #1

Using Tangent Sum and Difference Identities to Find an Exact Value

Using the Sum and Difference Identities for Sine, Cosine and Tangent, Ex 2

Sum and Difference Identities for Sine and Cosine

Sum and Difference Identities for Tangent

Sum and Difference Identities for Sine and Cosine, More Examples #3

Using the Sum and Difference Identities for Sine, Cosine and Tangent, Ex 3

Cosine of Difference

How to use the Cosine Sum and Difference Identities to Find Exact Values

Write sum and difference formula for tangent as one trig function

Tangent Sum & Difference Identities

Using The Sum and Difference Identity to Determine a Sine Function Value

Using the difference of two angles to evaluate the an angle for cosine, cos195

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