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### Trigonometry

 Trigonometry (from Greek trigonon 'triangle' + metron 'measure' or from Sanskrit trikon 'triangle' + miti 'measurement' = trikonmiti) is a branch of mathematics that studies triangles and the relationships between their sides and the angles between the sides. Trigonometry defines the trigonometric functions, which describe those relationships and have applicability to cyclical phenomena, such as waves. The field evolved during the third century BC as a branch of geometry used extensively for astronomical studies.

### Unit circle definition of trigonometric functions : Example: Trig ...

##### By: Sal Khan, Monterey Institute for Technology and Education

Worked example that uses the unit circle definition to evaluate trig functions

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

### Basic trigonometric ratios : Using Trig Functions Part II

##### By: Sal Khan

A couple of more examples of using Trig functions to solve the sides of a triangle.

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

### Trigonometric identities : Proof: cos(a+b) = (cos a)(cos b)-(sin a...

##### By: Sal Khan

Proof of the trig identity: cos(a+b) = (cos a)(cos b)-(sin a)(sin b)

If you're starting to sense that there may be more to trig functions than meet the eye, you are sensing right. In this tutorial you'll discover exciting and beautiful and elegant and hilarious relationships between our favorite trig functions (and maybe a

### Trigonometric identities : Navigation Word Problem

##### By: Sal Khan

Trigonometry problem involving two ships colliding.

If you're starting to sense that there may be more to trig functions than meet the eye, you are sensing right. In this tutorial you'll discover exciting and beautiful and elegant and hilarious relationships between our favorite trig functions (and maybe a

### Trigonometric identities : Proof: sin(a+b) = (cos a)(sin b) + (sin...

##### By: Sal Khan

Proof of the trig identity sin(a+b) = (cos a)(sin b) + (sin a)(cos b)

If you're starting to sense that there may be more to trig functions than meet the eye, you are sensing right. In this tutorial you'll discover exciting and beautiful and elegant and hilarious relationships between our favorite trig functions (and maybe a

### Trigonometric identities : Trig identities part 2 (part 4 if you w...

##### By: Sal Khan

More playing around with trig identities

If you're starting to sense that there may be more to trig functions than meet the eye, you are sensing right. In this tutorial you'll discover exciting and beautiful and elegant and hilarious relationships between our favorite trig functions (and maybe a

### Basic trigonometric ratios : Example: Using soh cah toa

##### By: Sal Khan, Monterey Institute for Technology and Education

Worked example evaluating sine and cosine using soh cah toa definition.

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

### Basic trigonometric ratios : Example: Solving a 30-60-90 triangle

##### By: Sal Khan, Monterey Institute for Technology and Education

This worked example can be done without trigonometry, but we do show how knowledge of 30-60-90 triangles can be helpful when evaluating trig functions

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

### Unit circle definition of trigonometric functions : Unit circle de...

##### By: Sal Khan

Extending SOH CAH TOA so that we can define trig functions for a broader class of angles

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

### Unit circle definition of trigonometric functions : Trigonometry w...

##### By: Sal Khan

The second part of the problem of the off-track ship captain

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

### Basic trigonometric ratios : Basic Trigonometry II

##### By: Sal Khan

A few more examples using SOH CAH TOA

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

### Unit circle definition of trigonometric functions : Unit Circle Ma...

##### By: Sal Khan

Walk-through of the Khan Academy Unit Circle Manipulative.

Videos and exercises on trigonometry. Watch the Geometry playlist first if you have trouble understanding the topics covered here.

### Host Mnemonics Proposed in Rfc #226

##### By: R. Braden

Technical Reference Publication

Excerpt: The set you suggest was created, I assume, by the systems programmer(s) who wrote TELNET in TENEX. It is a set of historical accidents, and shows it. A better source for standard mnemonics might be the NIC site codes, since these have been chosen with more care and will become familiar as we begin to use the NIC on-line. Surely the NIC is a more reasonable source for a defacto standard than a particular system programmer.

Vol. 12

### Fitting a Hyperbolic Sine Curve to Creep Data

##### By: Shiffman, Max; Friedman, Bernard
 1|2|3|4|5 Records: 41 - 60 of 2,568 - Pages:

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