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Proof of the tangent angle sum and difference identities
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Precalculus | High School Math | Khan Academy - Proof of the tangent angle sum and difference identities

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  • 9.3 hours of video
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Using the sine and cosine of the sum or difference of two angles, we can prove: tan(x+y)=(tan(x)+tan(y))/(1+tan(x)tan(y))

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