| Function name | Abbreviation | Value | Relation using words |
|---|
| sine of \(\theta\) | \(\sin \theta\) | \(\dfrac{b}{c}\) | \(\dfrac{\hbox{opposite}}{\hbox{hypotenuse}}\) |
| cosine of \(\theta\) | \(\cos \theta\) | \(\dfrac{a}{c}\) | \(\dfrac{\hbox{ adjacent}}{\hbox{hypotenuse}}\) |
| tangent of \(\theta\) | \(\tan \theta\) | \(\dfrac{b}{a}\) | \(\dfrac{\hbox{ opposite}}{\hbox{adjacent}}\) |
| cosecant of \(\theta\) | \(\csc \theta\) | \(\dfrac{c}{b}\) | \(\dfrac{\hbox{ hypotenuse}}{\hbox{opposite}}\) |
| secant of \(\theta\) | \(\sec \theta\) | \(\dfrac{c}{a}\) | \(\dfrac{\hbox{ hypotenuse}}{\hbox{adjacent}}\) |
| cotangent of \(\theta\) | \(\cot \theta\) | \(\dfrac{a}{b}\) | \(\dfrac{\hbox{ adjacent}}{\hbox{opposite}}\) |