A tangent is a straight line which will intersect at another line only once. Every tangent for each point will be different, because each tangent is exclusive only to one point in a graph.
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The tangent function will generate a calculator "math error" if the angle in questin is ±90 degrees. For these angles, the tangent function is not defined.
sin stands for sine cos stands for cosine and tan stands for tangent
A common tangent is a line which is tangent to two (or more) curves.
tangent(450) = 0.935809013
Tangent 39 = 0.809784033195