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Using the tangent angle addition identity | Trigonometry | Precalculus | Khan Academy
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Precalculus | High School Math | Khan Academy - Using the tangent angle addition identity | Trigonometry | Precalculus | Khan Academy

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Keep going! Check out the next lesson and practice what you’re learning: https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:trig/x9e81a4f98389efdf:using-trig-id/e/applying-angle-addition-formulas Find the tangent of 13pi/12 without a calculator using the tangent angle addition identity.

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