Definitions
from The Century Dictionary.
 Same as
trigonometrical .
from the GNU version of the Collaborative International Dictionary of English.
 Of or pertaining to trigonometry; performed by the rules of trigonometry.
 a curve one of whose coördinates is a trigonometric function of the other.
 See under
Function .  lines which are employed in solving the different cases of plane and spherical trigonometry, as sines, tangents, secants, and the like. These lines, or the lengths of them, are
trigonometrical functions of the arcs and angles to which they belong.  See under
Survey .
from Wiktionary, Creative Commons Attribution/ShareAlike License.
 adjective mathematics of, relating to, or constructed using
trigonometry
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 adjective of or relating to or according to the principles of trigonometry
Etymologies
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Examples

The six functions just defined are variously known as the trigonometric, circular, or goniometric functions
LearnHub Activities 2008

It should be noticed that while a, b, and h are lines, the ratio of any two of them is an abstract number; that is, the trigonometric functions are abstract numbers.
LearnHub Activities 2008

It should be noticed that while a, b, and h are lines, the ratio of any two of them is an abstract number; that is, the trigonometric functions are abstract numbers.
LearnHub Activities 2008

On the other hand, the trigonometric functions are better seen as the coordinate functions of a point traveling around the unit circle at unit speed.

And so there must be some equation relating the exponential to the trigonometric functions.

To make sure he was spacing the holes exactly right, he scrawled a triangle and some trigonometric calculations on a notepad.
Help Wanted on Factory Floor James R. Hagerty 2011

They thought they could just proceed from there, but things got messy (sorry) as they cut the pizza more times, or, as New Scientist puts it, “the solution still included a complicated set of sums of algebraic series involving tricky powers of trigonometric functions,” summed up more succinctly as “ugly.”
The mathematics of pizza slicing ewillett 2009

It has to do with what happens when you do Taylor series expansions of trigonometric functions of imaginary numbers.

When trigonometric functions are added, then the number of nines can greatly increase.
Wolfram Blog : 9–9–9 2009

The great trigonometric waterfalls, warm as bathwater for once.
365 tomorrows » 2010 » May : A New Free Flash Fiction SciFi Story Every Day 2010
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