【裏技】三角関数をたった１０秒で暗算する方法

Trigonometric function techniques (30 seconds) + secret solution (10 seconds) I solved it in 5 seconds in the video! (blushes) I have a feeling this will be asked in the common test mock exam! If you can prove sin or tan, please let me know on Twitter👍 P.S. Today's Paschale is here https://note.com/pfsbr123/n/n5965a8ad... Twitter is here →   / todai_igakubu   ~~~~~~~~ ■10 minutes in the morning exam study cafe from the University of Tokyo's Faculty of Medicine Subscribe to PASSLABO's channel →    / @passlabo   ■A must-see for those who want to study with University of Tokyo students! Click here to register for the official LINE@ → http://line.me/R/ti/p/@subaru_todai (Study methods and Q&A will be broadcast on LINE LIVE!!) ====== [Your comments may be reflected in the video!] If you have any questions or requests for explanations, please post as many as you like. I'll check them one by one and make videos of the ones that are useful ^ ^ ====== ■For those who want to know all about how to study from a deviation score of 43 to passing the entrance exam to Tokyo University → https://amzn.to/2GRW3tL ■Official Twitter is here →   / todai_igakubu   =========== ■PASSLABO member information (note) ＊Check out the notes of members you're interested in!! "1" Usami Subaru Tokyo University Faculty of Medicine / PASSLABO Director → https://note.mu/pfsbr123/n/nb6fe7782cef8 "2" Kuanai Waseda / PASSLABO Cutting Captain → https://note.mu/pfsbr123/n/n5f377ebad8d2 "3" Aidaman Tokyo University Reversal Pass / PASSLABO Singing Brother → https://note.mu/pfsbr123/n/n410cc19c6d54 "4" Kumatan Dropped 1 point in the Faculty of Letters at the University of Tokyo? /PASSLABO Healing Character → https://note.mu/pfsbr123/n/n429b06b1d9b4 =========== #PASSLABO #From the University of Tokyo Faculty of Medicine #See the description column♪ Posted almost every day at 6:30am! Let's do some morning activities together with videos