Tangent is used in calculus to compute the slope of a curve. Because curves do not have uniform slopes, unlike lines, their slopes change. A tangent is the slope of a curve at a specific point.
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Cotangent is a trigonometric function. It is the reciprocal of the tangent.
They are different trigonometric functions!
A reciprocal trigonometric function is the ratio of the reciprocal of a trigonometric function to either the sine, cosine, or tangent function. The reciprocal of the sine function is the cosecant function, the reciprocal of the cosine function is the secant function, and the reciprocal of the tangent function is the cotangent function. These functions are useful in solving trigonometric equations and graphing trigonometric functions.
Sine Cosine Tangent ArcSine ArcCosine ArcTangent
It is a trigonometric function whose argument is the number theta.