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rTRIGONOMETRIC IDENTITIES - Wright State University

3. The sum and di erence formulas This section begins with the veri cation of the di erence formula for the cosine function: cos( − ) = cos cos +sin sin where − denotes the measure of the di erence of the two angles and : Once this identity is established it can be used to easily derive other important identities.

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  States, University, Wright, Wright state university, Di erences, Erences

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