Definitions
from Wiktionary, Creative Commons Attribution/ShareAlike License
 adj. of, relating to, or constructed using trigonometry
from the GNU version of the Collaborative International Dictionary of English
 Of or pertaining to trigonometry; performed by the rules of trigonometry.
from The Century Dictionary and Cyclopedia
 Same as trigonometrical.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 adj. of or relating to or according to the principles of trigonometry
Etymologies
Sorry, no etymologies found.
Examples

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

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.

To make sure he was spacing the holes exactly right, he scrawled a triangle and some trigonometric calculations on a notepad.

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.”

When trigonometric functions are added, then the number of nines can greatly increase.

The great trigonometric waterfalls, warm as bathwater for once.
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And so there must be some equation relating the exponential to the trigonometric functions.

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.

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

The plain fact that there is an equation relating the trigonometric functions to the exponential function is really cool.
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