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More Lessons for Trigonometry, Math Worksheets

In this lesson, we will look at co-function identities.**What are the Co-function Identities?**

A function f is cofunction of a function g if f(A) = g(B) when A and B are complementary angles.

sin A = cos(90° - A)

cos A = sin(90° - A)

sin A = cos B, if A + B = 90°

sec A = csc(90° - A)

csc A = sec(90° - A)

sec A = csc B, if A + B = 90°

tan A = cot(90° - A)

cot A = tan(90° - A)

tan A = cot B, if A + B = 90°

### Videos

Cofunction Identities

This video explains the cofunction identities and how to determine cofunctions given a function value. What is a cofunction. Finding the cofunction. Using the cofunction relationship
Cofunctions

Cofunction Identities Trig

You can use the free Mathway widget below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

More Lessons for Trigonometry, Math Worksheets

In this lesson, we will look at co-function identities.

A function f is cofunction of a function g if f(A) = g(B) when A and B are complementary angles.

sin A = cos(90° - A)

cos A = sin(90° - A)

sin A = cos B, if A + B = 90°

sec A = csc(90° - A)

csc A = sec(90° - A)

sec A = csc B, if A + B = 90°

tan A = cot(90° - A)

cot A = tan(90° - A)

tan A = cot B, if A + B = 90°

This video explains the cofunction identities and how to determine cofunctions given a function value. What is a cofunction. Finding the cofunction. Using the cofunction relationship

Rotate to landscape screen format on a mobile phone or small tablet to use the **Mathway** widget, a free math problem solver that **answers your questions with step-by-step explanations**.

You can use the free Mathway widget below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

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