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Explanation with examples of associated arcs and reduction to the first quadrant. Let's see how to obtain the formulas of associated arcs, how to use them and some calculation examples. In goniometry and trigonometry, the recognition of associated arcs / angles is useful because it allows you to obtain the value of the sine and cosine functions of angles of the II, III and IV quadrants having memorized the value of the corresponding arcs / angles in the first quadrant. You can find many more videos on goniometry and trigonometry in the playlist ✔ http://goo.gl/pyH9l Follow me on Facebook & Instagram, it's the cool thing to do these days ;) ✔ / lessthan3math ✔ / elia.bombardelli Information on the video lessons and complete list ✔ https://goo.gl/zq67Eo The equipment I use to create the videos ✔ http://amzn.to/2y73tlW Subscribe to the channel, many more videos coming soon ✔ http://goo.gl/PH8ZF1 Associated arches - list of formulas: ✔ https://goo.gl/1bEYTG ____________________________________________________________ Thanks to everyone for the LIKES, SUBSCRIPTIONS and COMMENTS =) LessThan3Math is the section of my channel created with the aim of giving a hand to as many students as possible. If you find the video lessons useful and want many more to be made, you can support the project. Take a look here: ✔ https://goo.gl/JMLRtH ____________________________________________________________ Only for collaboration proposals or important communications [email protected] for other communications or requests leave a comment The background music at the beginning and end of the video comes from https://incompetech.com/ (Kevin MacLeod - Royalty Free Music)