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The trigonometric functions most widely used in modern mathematics are the sine, the cosine, and the tangent functions. Their reciprocals are respectively the cosecant, the secant, and the cotangent functions, which are less used.
Definition: Sin-Cos-Tan. Let \(x\) be an angle. Consider the terminal side of the angle \(x\), and assume that the point \(P(a,b)\) is a point on the terminal side of \(x\). If \(r\) is the distance from \(P\) to the origin \((0,0)\), then we define the sine, cosine, tangent, cosecant, secant, and cotangent as follows: \[\boxed {\begin{aligned}
A sine wave produced naturally by a bouncing spring: Plot of Sine. The Sine Function has this beautiful up-down curve (which repeats every 2 π radians, or 360°). It starts at 0, heads up to 1 by π /2 radians (90°) and then heads down to −1. Plot of Cosine.
know how cos, sin and tan functions are defined for all real numbers; be able to sketch the graph of certain trigonometric functions; know how to differentiate the cos, sin and tan functions; understand the definition of the inverse function f−1(x) = cos− 1(x).
Sine, Cosine and Tangent (often shortened to sin, cos and tan) are each a ratio of sides of a right angled triangle: For a given angle θ each ratio stays the same. no matter how big or small the triangle is. To calculate them: Divide the length of one side by another side. Example: What is the sine of 35°?
There are six trigonometric functions: sine, cosine, tangent and their reciprocals cosecant, secant, and cotangent, respectively. Sine, cosine, and tangent are the most widely used trigonometric functions.
Understanding and Using the Inverse Sine, Cosine, and Tangent Functions. In order to use inverse trigonometric functions, we need to understand that an inverse trigonometric function “undoes” what the original trigonometric function “does,” as is the case with any other function and its inverse.
