Trigonometry
The word trigonometry comes from the Greek words trigonon (“triangle”) and metron (“to measure”). Trigonometry, the branch of mathematics that deals with specific functions of angles and their application.
Basic functions
There are six functions of an
angle commonly used in trigonometry. They are tabulated below.
|
Functions |
Abbreviation |
Relationship to
sides of a right triangle |
|
Sine Function |
Sin θ |
Opposite side/
Hypotenuse |
|
Tangent Function |
Tan θ |
Opposite side / Adjacent side |
|
Cosine Function |
Cos θ |
Adjacent side /
Hypotenuse |
|
Cosecant Function |
cosecθ |
Hypotenuse /
Opposite side |
|
Secant Function |
secθ |
Hypotenuse /
Adjacent side |
|
Cotangent
Function |
cotθ |
Adjacent side /
Opposite side |
Trigonometric Identities
Trigonometric identities and formulas that can be used to simplify expressions, solve equations, and evaluate integrals.
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