tag:blogger.com,1999:blog-8808382932507655220.post1146521878155887987..comments2024-03-10T23:43:18.649-07:00Comments on Calculus at 34: All Students Take Calculus in SohCahToasantiagomfprhttp://www.blogger.com/profile/00983592284781620432noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-8808382932507655220.post-5569930480407615572017-07-05T17:00:19.278-07:002017-07-05T17:00:19.278-07:00Why bother memorizing all these formulae & let...Why bother memorizing all these formulae & let the students use a scientific calculator. Through all my 37 years in the oil business, I have observed that all the engineers use calculators & computer programs.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8808382932507655220.post-87506409517513853732013-03-14T19:50:26.987-07:002013-03-14T19:50:26.987-07:00Thanks for the tip. I'll be sure to use it in ...Thanks for the tip. I'll be sure to use it in my final coming up in 3 weeks!santiagomfprhttps://www.blogger.com/profile/00983592284781620432noreply@blogger.comtag:blogger.com,1999:blog-8808382932507655220.post-63918740835975898172013-03-14T13:35:51.796-07:002013-03-14T13:35:51.796-07:00Another visual and memorization cue for memorizing...Another visual and memorization cue for memorizing Sin Cos and Tan in degrees at 0,45, and 90. On the Unit Circle, Sin is the Y axis and Cos is the X axis, at 0 degrees you are on the X axis so the answer is 1 and Sin is at its furthest away from the Y axis so the answer is 0. at 90 degrees you are on the Y axis so Sin is 1 and cos is at it's furthest away from the x axis to the answer is 0.<br /><br />No helpful tricks for memorizing the value at 45 degrees but Cos and Sin have the same Value at 45 degrees which is sqrt(2)/2<br /><br />Tan is again just Sin over cosine so we have at 0 degrees 0/1 = 0, at 45 degrees, a value over itself which is 1, and at 90 degrees 1/0 which is undefined.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8808382932507655220.post-27195062461660054992013-03-14T13:22:19.641-07:002013-03-14T13:22:19.641-07:00Not necessarily a Mnemonic but a very useful visua...Not necessarily a Mnemonic but a very useful visual cue for memorizing the values of Sin, Cos, and Tan at 0,30,45,60 and 90. If you can memorize one column then Cos is Sin backwards.<br />Sin in degrees at {0,30,45,60, 90) is {0,1/2, sqrt(2)/2, sqrt(3)/2, 1} cos is the values backwards {1, sqrt(3)/2, sqrt(2)/2, 1/2, 0} and then Tan is just sin/cos. You substitute degrees for their equivalent in radsAnonymousnoreply@blogger.com