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What is the value of tan 1 upon 2?

Updated: 12/24/2022
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For the tangential value tan θ = 1/2, the angle θ is 26.565° (0.464 radians).

The tangent is the opposite side over the adjacent side for an angle,

or otherwise sin θ /cos θ.

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Q: What is the value of tan 1 upon 2?
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