tan(1) = 1.5574 where the angle is measured in radians.
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Any number can be a tan. So -sqrt(17), 19.56, 45678942 are all examples of tan. Cosine can have any value in the range [-1, 1].
1/sqrt(3)
1 because tan(5 pi / 4) = 1
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.
= tan (48.323 deg) = 1.1232