In this video I manually (and painstakingly) plot an approximation of the projection of the 3D trefoil knot onto the xy-plane. I begin by converting the parametric equations of the trefoil knot into polar coordinates, and then find the values where it is max and minimum until the projection repeats itself. I then determine the min and max of the z values, and use this to determine where the projection overlaps at each intersection point. I then compare my manual graph with the computer-drawn one, and my approximation leaves out the 3 inflection points. I also plot the trefoil knot in 3D using the amazing GeoGebra graphing calculator as well as the new Desmos' graphing calculator. #math #trefoilknot #geogebra #desmos #calculus Timestamps: - Exercise 3: Trefoil Knot: 0:00 - Solution: Projection of the curve onto the xy-plane: 2:41 - Converting to polar coordinates: 3:27 - Polar equation for the projection onto the xy-plane: 10:37 - Obtaining minimum and maximum values of r for various angles until we rotate back to the starting point: 11:11 - Manually graphing an approximate projection on the xy-plane: 23:09 - Determining how the curve overlaps by finding the minimum and maximum values of z. Initially finding max values: 28:52 - Minimum values for z: 35:45 - Minimum and maximum values for z occurs at r = 2: 38:50 - Comparing max and min values of z at intersection points to determine overlap: 41:06 - Computer-drawn graphs of the Trefoil knot and its projection, which has inflection points: 45:39 - Graphing the trefoil knot in GeoGebra: https://www.geogebra.org/calculator/ckmexx42 48:15 - Using Grok AI to plot a tube around the trefoil knot: https://x.com/i/grok/share/TPVALzOLEOm5h4GLZhx6OuBK5 48:35 - Plotting in Desmos' new 3D graphing calculator: https://www.desmos.com/3d/dn5bonsvwf 49:41 Notes and playlists: - Summary: https://inleo.io/threads/view/mes/re-leothreads-34k6ldabs - Sections playlist: https://www.youtube.com/playlist?list=PLai3U8-WIK0GwdMY-E9_4LsmYmO-IxcoX - Notes: https://peakd.com/hive-128780/@mes/omhbcxkw - Vector Functions playlist: https://www.youtube.com/playlist?list=PLai3U8-WIK0HQl7xTQBS_O8Te8PcpNm4U . ------------------------------------------------------ Become a MES Super Fan! https://www.youtube.com/channel/UCUUBq1GPBvvGNz7dpgO14Ow/join DONATE! ʕ •ᴥ•ʔ https://mes.fm/donate SUBSCRIBE via EMAIL: https://mes.fm/subscribe MES Links: https://mes.fm/links MES Truth: https://mes.fm/truth Official Website: https://MES.fm Hive: https://peakd.com/@mes Email me: contact@mes.fm Free Calculators: https://mes.fm/calculators BMI Calculator: https://bmicalculator.mes.fm Grade Calculator: https://gradecalculator.mes.fm Mortgage Calculator: https://mortgagecalculator.mes.fm Percentage Calculator: https://percentagecalculator.mes.fm Free Online Tools: https://mes.fm/tools iPhone and Android Apps: https://mes.fm/mobile-apps

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