How to use and understand cofunction identities

👉 Learn how to evaluate trigonometric functions using trigonometric identities. Trigonometric identities are equalities that involve trigonometric functions. We will focus on the cofunction identities and even-odd identities. The cofunction identities property states that the value of the trigonometric function of an angle is equal to the value of the cofunction of the complement of the angle. The cofunctions are sine and cosine, tangent and cotangent, cosecant and secant. For example: sin (90 - x) = cos x; tan (90 - x) = cot x, etc The even/odd identities are trigonometric identities used to evaluate negative angles of even or odd trigonometric functions. Note that for odd functions: f(-x) = -f(x) and for even functions f(-x) = f(x). Sine and tangent with their reciprocal functions are odd, while cosine with its reciprocal function are even. Thus, sin(-x) = -sin x; cos(-x) = cos x, etc. Other very important trigonometric identities are: tan x = sin x / cos x and cot x = cos x / sin x. With the knowledge of these identities, we can evaluate the trigonometric functions of angles given the value of the trigonometric functions of other (necessary) angles. 👏SUBSCRIBE to my channel here: https://www.youtube.com/user/mrbrianm... ❤️Support my channel by becoming a member:    / @brianmclogan   🙋‍♂️Have questions? Ask here: https://forms.gle/dfR9HbCu6qpWbJdo7 🎉Follow the Community:    / mrbrianmclogan   Organized Videos: ✅ Trigonometric Functions and The Unit Circle    • Trigonometric Functions and The Unit Circle   ✅ The Unit Circle | Learn About    • The Unit Circle | Learn About   ✅ Points of the Unit Circle | Learn About    • Points of the Unit Circle | Learn About   ✅ Angles of the Unit Circle | Learn About    • Angles of the Unit Circle | Learn About   ✅ Trigonometric Functions of the Unit Circle    • Trigonometric Functions of the Unit Circle   ✅ Find the Point on the Unit Circle    • Find the Point on the Unit Circle   ✅ Evaluate Trigonometric Functions Using the Unit Circle    • Evaluate Trigonometric Functions Using the...   ✅ Evaluate the Six Trigonometric Functions Given and Angle    • Evaluate the Six Trigonometric Functions G...   ✅ Evaluate trigonometric functions using a calculator    • Evaluate trigonometric functions using a c...   ✅ Evaluate trigonometric functions using identities    • Evaluate trigonometric functions using ide...   🗂️ Organized playlists by classes here:    / mrbrianmclogan   🌐 My Website - http://www.freemathvideos.com 🎯Survive Math Class Checklist: Ten Steps to a Better Year: https://www.brianmclogan.com/email-ca... Connect with me: ⚡️Facebook -   / freemathvideos   ⚡️Instagram -   / brianmclogan   ⚡️Twitter -   / mrbrianmclogan   ⚡️Linkedin -   / brian-mclogan-16b43623   👨‍🏫 Current Courses on Udemy: https://www.udemy.com/user/brianmclog... 👨‍👩‍👧‍👧 About Me: I make short, to-the-point online math tutorials. I struggled with math growing up and have been able to use those experiences to help students improve in math through practical applications and tips. Find more here: https://www.freemathvideos.com/about-me/ #trig #unitcircle #brianmclogan