Write the expression in terms of the appropriate cofunction.cot(25°)\cot\left(25\degree\right)cot(25°)

tan ⁡ ( 65 ° ) \tan\left(65\degree\right) tan ( 65° )

Write the expression in terms of the appropriate cofunction. cot ( 25 ° ) \cot\left(25\degree\right) cot ( 25° )

Welcome back, everyone. Let's try solving this problem. So here we are asked to write the expression in terms of the appropriate cofunction, and we are given the cotangent of 25 degrees. Now to solve this problem, our first step is going to be to find the appropriate cofunction for the cotangent, and that's going to just be the tangent. We learned this in the previous video. You can also recognize the names. Right? The cofunction for tangent would be cotangent, and so the cofunction for cotangent is just tangent. Now what we need to put inside the tangent is the complementary angle. And since I see our angle is measured in degrees, we're going to have 90 degrees minus the angle we started with, which is 25 degrees. That's always how you can find the complementary angle. So what I can do is subtract 25 from 90, and that's going to give me 65. So what we're gonna end up with is the tangent of 65 degrees, and that is the cofunction for the cotangent of 25 degrees. Hope you found this video helpful. Thanks for watching.

Write the expression in terms of the appropriate cofunction. cot ⁡ ( 25 ° ) \cot\left(25\degree\right) cot ( 25° )

tan ⁡ ( 65 ° ) \tan\left(65\degree\right) tan ( 65° )

tan ⁡ ( 25 ° ) \tan\left(25\degree\right) tan ( 25° )

cot ⁡ ( 65 ° ) \cot\left(65\degree\right) cot ( 65° )

cot ⁡ ( 25 ° ) \cot\left(25\degree\right) cot ( 25° )

Table of contents

Skip topic navigation

0. Fundamental Concepts of Algebra3h 32m
1. Equations and Inequalities3h 27m
2. Graphs1h 43m
3. Functions & Graphs2h 17m
4. Polynomial Functions1h 54m
5. Rational Functions1h 23m
6. Exponential and Logarithmic Functions2h 28m
7. Measuring Angles40m
8. Trigonometric Functions on Right Triangles2h 5m
9. Unit Circle1h 19m
10. Graphing Trigonometric Functions1h 19m
11. Inverse Trigonometric Functions and Basic Trig Equations1h 41m
12. Trigonometric Identities 2h 34m
13. Non-Right Triangles1h 38m
14. Vectors2h 25m
15. Polar Equations2h 5m
16. Parametric Equations1h 6m
17. Graphing Complex Numbers1h 7m
18. Systems of Equations and Matrices3h 6m
19. Conic Sections2h 36m
20. Sequences, Series & Induction1h 15m
21. Combinatorics and Probability1h 45m
22. Limits & Continuity1h 49m
23. Intro to Derivatives & Area Under the Curve2h 9m

8. Trigonometric Functions on Right Triangles

Cofunctions of Complementary Angles

Precalculus

8. Trigonometric Functions on Right Triangles

Cofunctions of Complementary Angles

Previous problemNext problem

Struggling with Precalculus?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

Write the expression in terms of the appropriate cofunction.
$\cot\left(25\degree\right)$

$\tan\left(65\degree\right)$

$\tan\left(25\degree\right)$

$\cot\left(65\degree\right)$

$\cot\left(25\degree\right)$

Previous problemNext problem

Verified step by step guidance

Understand the concept of cofunctions: Cofunctions are pairs of trigonometric functions that are complementary, meaning their angles add up to 90 degrees. For example, the cofunction of cotangent is tangent.

Identify the angle given in the problem: The angle provided is 25 degrees, and we need to find its cofunction.

Determine the complementary angle: Since cofunctions are based on complementary angles, calculate the complementary angle by subtracting the given angle from 90 degrees. So, 90° - 25° = 65°.

Relate cotangent to its cofunction: The cofunction of cotangent is tangent. Therefore, cot(25°) can be expressed in terms of its cofunction as tan(65°).

Verify the options provided: Among the options given, tan(65°) is the correct expression in terms of the cofunction of cot(25°).