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Use Trig. Identities to find Exact Value (Sum Identities) (Pete Surgent)
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How To Find The Exact Values of Trig Functions (The Organic Chemistry Tutor)
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Using sum and difference formula to find the exact value with cosine (Brian McLogan)
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Trigonometry - Finding Exact Value Using Sum and Difference Identities Example 1 (Steve Crow)
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Pre-Calculus - How to find the exact value by using the sum of two angles formula with cosine (Brian McLogan)
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Sum and Difference Formulas for Sine, Cosine, and Tangent to Find Exact Values (Mario's Math Tutoring)
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Formulas for Trigonometric Functions: Sum/Difference, Double/Half-Angle, Prod-to-Sum/Sum-to-Prod (Professor Dave Explains)
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Product To Sum Identities and Sum To Product Formulas - Trigonometry (The Organic Chemistry Tutor)
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Finding the Exact Value of Trig Functions Using the Sum Identities (MathAngel369) (MathAngel369)
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How to find exact values of trig expressions with sum and difference identities (Ms Shaws Math Class)
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