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Finding Exact Trigonometric Values Using Sum and Difference Formulas
Convert angles to sum or difference of 30, 45, and 60 degrees to solve.
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Finding Exact Values of Trigonometric Functions using Sum and Difference Formulas - Overview
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MAT.TRG.305.06 (Finding Exact Trigonometric Values Using Sum and Difference Formulas - Trigonometry)
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