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Using sum and difference formula to find the exact value with cosine

👉 Learn how to evaluate the cosine of an angle in radians using the sum/difference formulas. To do this, we first express ...
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Evaluate using the sum and difference formulas

In this video, I will show you how to evaluate an angle in degrees using the sum formula of cosine. We will need to use the formula because we cannot evaluate using the unit circle. We will then ...