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# What does the symbol theta stand for when, working out trigonometry?

By Lee Mansfield on the 11th of June, 2012

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Theta (written as θ) is used to represent an angle. So, for example, a right angle would have θ=90.

Theta is a letter of the Greek alphabet. (Long ago mathematicians ran out of English letters and so started using the Greek alphabet.)

By Chelsea Bunne on the 11th of June, 2012

## Understand the graphs of trigonometric functions for angles of any size

### Graphs and Trigonometry

We can plot graphs of the three trigonometric functions, Sin, Cos and Tan.

x axis gives the angle (Ao), the y axis gives the value for SinA/CosA/TanA

You read it like any other graph.

Sin Graph

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Cos Graph

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Tan Graph

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