Sine (sin) Cosine (cos) Tangent (tan) Cotangent (cot) Secant (sec) Cosecant (CSC) The fundamental notions of trigonometry are the angle functions and their applications to computations. So, the triangle measurement is the sum of its sides and angles. This topic covers: - Unit circle definition of trig functions - Trig identities - Graphs of sinusoidal & trigonometric functions - Inverse trig functions & solving trig equations - Modeling with trig functions - Parametric functions as the ratio of the sides of a triangle. Also, we were only able to find the value of trig functions of angles upto 90 degrees. But in unit circle definition, the trigonometric functions sine and cosine are defined in terms of the coordinates of points lying on the unit circle x^2 + y^2=1. So as you can see, since trig functions are really just relationships between sides, it is possible to work with them in whatever form you want; either in terms of the usual "sine", "cosine" and "tangent", or in terms of algebra. Example 2.4.6.2 2.4.6. 2. Express cos2(tan−1 x) cos 2 ( tan − 1 x) as an algebraic expression involving no For sin, cos and tan the unit-length radius forms the hypotenuse of the triangle that defines them. The reciprocal identities arise as ratios of sides in the triangles where this unit line is no longer the hypotenuse. D7Tvs.

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