What is the concept of tangent in trigonometric function?

The tangent in trigonometric function is the ratio of two right angles. In Rt△ABC (right triangle), ∠C = 90, AB is the opposite side C of ∠ C, BC is the opposite side A of ∠A, AC is the opposite side B of ∠B, and the tangent function is tanB=b/a, that is, tanB=AC/BC.

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