Secant, Cosecant and Cotangent


In these lessons we will look at the reciprocal trigonometric functions: secant, cosecant and cotangent.




Share this page to Google Classroom

Related Pages
Trigonometric Functions
Trigonometric Graphs
Lessons On Trigonometry
Trigonometric Identities

We can get three more trigonometric functions by taking the reciprocals of three basic functions: sine, cosine and tangent.

The secant function is the reciprocal of the cosine function. The abbreviation of secant is sec.

The cosecant function is the reciprocal of the sine function. The abbreviation of cosecant is csc or cosec.

The cotangent function is the reciprocal of the tangent function. The abbreviation of cotangent is cot.

The following diagram shows the Reciprocal Trigonometric Functions. Scroll down the page for more examples and solutions on how to use the reciprocal trigonometric functions.

reciprocal trig functions
 

Example:
Given that , and that θ is acute, find, without using a calculator, the value of
a) sec θ
b) cot θ

Solution:
We can use the Pythagorean theorem to get the third side of the right triangle.

 
a) We then get that

 
b) We have

 




Videos

Reciprocal Ratios: Cosecant, Secant, Cotangent.

Opposite Sides, Adjacent Sides and Hypotenuse of a Right Triangle
Definition of Cos, Sin, Tan, Csc, Sec, Cot

Find the Cosecant of an Angle in a Right Triangle
Given any two sides of a right triangle, you can find any of the 6 trigonometric ratios. This problem demonstrates how to determine the cosecant of a right triangle. Using the Pythagorean Theorem to find a missing side is demonstrated.

Reciprocal Identities of Trig Functions
This tutorial covers the reciprocal identities and shows them in various forms.



Try out our new and fun Fraction Concoction Game.

Add and subtract fractions to make exciting fraction concoctions following a recipe. There are four levels of difficulty: Easy, medium, hard and insane. Practice the basics of fraction addition and subtraction or challenge yourself with the insane level.

Fraction Concoction Game



We welcome your feedback, comments and questions about this site or page. Please submit your feedback or enquiries via our Feedback page.