Basic Trigonometry: Sin Cos Tan (NancyPi)

MIT grad shows how to find sin, cos, and tan using SohCahToa as well as the csc, sec, and cot trig functions. To skip ahead: 1) For how to find the adjacent, opposite, and hypotenuse sides of the right triangle, skip to 1:13. 2) For how to find the value of SIN of theta using SOH CAH TOA, skip to 3:16. 3) For how to find COS, skip to 4:15. 4) For how to find TAN, skip to 4:56. 5) For how to find CSC, SEC, AND COT from the sin, cos, and tan functions, skip to 5:56. 6) For harder examples of…


  1. Thank you very much Nancy for excellent lectures .And can easily grasp concepts …You are simply the BEST.

  2. Guys! I don't think she writes backwards! I think she just mirrored what she was writing. check out the channel mahalodotcom. Then she also writes backwards. Another example: Jimmy Chang on eHow. I don't think there are that many people that can write in reverse that easily.

  3. This is so useful during quarantine. My teacher stopped teaching and its just book work so you're so helpful thanks.

  4. Literally better then my teacher I learned more from you then my teacher for the past few years

  5. You are a God send, I was desperate to find someone who could help me learn Trig so I can take the Classical Learning Test, and your teaching style is easy to understand and thorough. Thanks a million. Also, you are so beautiful, if every woman looked like you this world would be a better place.

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