Unit Circle Definition of Trig Functions

Comments · 367

• CC

  @cchenault9100 · 7 years ago

  I motion that whenever our generation gets to run this planet, that we give this man the award he deserves

  219

• BA

  @basicburgers978 · 8 years ago

  wow this vid is 10 years old and can still save my ass in exams

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• OR

  @OrinjFlames · 10 years ago

  Thanks for these videos. My teacher for trig just sucks so badly it's insane.

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• KH

  @khanacademy · 18 years ago

  You've already found the relation.  The slope of a line is equal to the tangent of the angle between the line and the x-axis (or any horizontal line) .

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• AG

  @agu2067 · 5 years ago

  Sal (and his software) has come such a long way..I'm so thankful. Continue success Sal!!!

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• PR

  @principal_optimism · 11 years ago

  Saving grades 1 video at a time! good going khan academy. You truly are making the world a better place

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• HY

  @HybridXShadow · 12 years ago

  Been coming to you for help for the past 2 years and you've always helped me and I can't believe it's only coming from one person you sir are a lifesaver.

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• ER

  @ericbhatnagar2873 · 10 years ago

  my teacher  explained none of this shit about how we apply the ratios on the graph. You are awesome. Thanks for this video

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• MO

  @mostafizurrahman2694 · 5 years ago

  This old video is much better than the current one on the website for understanding the unit circle definition of trigonometric functions. I think one should watch both to gain a good understanding.

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• WI

  @williamf4524 · 9 years ago

  Thanks so much for all these videos. I am starting pre-calculus in a few weeks, so I decided to come here and watch these videos to get a jump on understanding it. Thanks to you I am not worried at all about being able to understand the work or getting an A in the class, because if I have any problems in class or understanding my professor, I will just come right back to your videos. You are awesome!

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• AS

  @ashokgupta3594 · 9 years ago

  I will be <b>forever</b> grateful to you, Sal. It was a month ago when trig started to haunt me. then I discovered your trig playlist and these methods. <br>I tell you, this has been a boon for me. trig is exceptionally important for a math student. I used to fear trig. <br>I was just solving some questions and recalled what you taught me. and I picked up the phone to express my gratitude and gratefulness to you. <br>Thank you. 🙂🙂🙂🙂🙂🙂

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• LA

  @lavanya-wo5gj · 10 years ago

  I&apos;ll forever be grateful to you sal

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