Update Ring Website - Resources Section - Short Movies - atan() Function - Ring Programming Language - Lesson 108
'<a href="https://www.youtube.com/watch?v=qX25s1pp2Yo&list=PLpQiqjcu7CuH063yQeQi0LQcbV4dynHgw&index=108" target="_blank">acos() Function - Ring Programming Language - Lesson 107 </a>'
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[
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+ '<a href="https://www.youtube.com/watch?v=ziy2psncDWM&index=109&list=PLpQiqjcu7CuH063yQeQi0LQcbV4dynHgw" target="_blank">atan() Function - Ring Programming Language - Lesson 108 </a>'
],
[
'<a href="" target="_blank"> </a>'
