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The Sum and Difference Identities

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More Lessons for Trigonometry

Math Worksheets

A series of free Trigonometry Lessons.

Trigonometric Identities to Evaluate Expressions (Sum and Difference Identity)
How to use a sum identity to evaluate sin(75 degrees) and tan (π/12)
Sum and Difference Identities
The sum and difference identities for sine, cosine, and tangent, followed by a few examples.

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