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We've used the unit circle to define the trigonometric functions for acute angles so far. We'll need more than acute angles in the next section where we'll look at oblique triangles. Some oblique triangles are obtuse and we'll need to know the sine and cosine of obtuse angles.
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www.clarku.edu/~djoyce/trig/functions.html
www.clarku.edu/~djoyce/trig/functions.html
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Since Q(x,y) is a point on the unit circle, we know that . This fact and the definitions of the trigonometric functions give rise to the following fundamental identities:
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www.sosmath.com/trig/Trig2/trig2/trig2.html
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Trigonometric Equations ... The Derivatives of Trigonometric Functions ... The Hyperbolic Functions...
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www.sosmath.com/trig/trig.html
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Trigonometric functions - Wikipedia, the free encyclopedia
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In mathematics, the trigonometric functions (also called circular functions) are functions of an angle. They are used to relate the angles of a triangle to the lengths of the sides of a triangle. Tr...
en.wikipedia.org/wiki/Trigonometric_functions
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It will become obvious that the trigonometric functions, sine, cosine, and tangent in particular, are the most frequently used functions you will see in introductory physics. The most important trigonometric identities are listed in your supplementary information sheet.
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dept.physics.upenn.edu/courses/gladney/mathphys/subsubs...
dept.physics.upenn.edu/courses/gladney/mathphys/subsubsection1_1_4_2.html
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Multimedia learning units on ... - maths online Gallery ... Geometry and numerical values are related, and it is emphasized that the trig functions do not change under rescalings of the triangle's size. The applet is started from the red button in its own window. ... Graphs of elementary trigonometric functions (graphics)
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www.univie.ac.at/future.media/moe/galerie/wfun/wfun.htm...
www.univie.ac.at/future.media/moe/galerie/wfun/wfun.html
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Trigonometric functions are often omitted in basic calculus courses for students not majoring in the mathematical sciences. ... In the first section, we focus on the use of the sine function to model cyclical phenomena, postponing the introduction of the other trigonometric functions to Section 2. Sections 3 and 4 deal...
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people.hofstra.edu/Stefan_Waner/trig/trigintro.html
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The Trigonometric Functions ; by; Stefan Waner and Steven R. Costenoble ... This Section: 2. The Six Trigonometric Functions ... 1. Modeling with the Sine Function Section 2 Exercises 3. Derivatives of Trigonometric Functions Trigonometric Functions Main Page "Real World" Page...
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people.hofstra.edu/Stefan_Waner/trig/trig2.html
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