Chain Rule (3 of 3: Proving a circle property)

[@kristijanknego1287]

I just want to say thank you. your way of explaining is clear and with passion and I love how you do it. you probably won't see this but you helped me a lot and i just want to say thank you!

[@ksrajavel]

The best part of the video is in 4:25

[@billyjoethethird8436]

Isn't it possible for one to draw a line from the radius to a given point on the circle to find the gradient by taking the negative reciprocal of the slope then using point slope form?

[@shikharmukherji1236]

That'll work

[@eikoGoldstein]

what is the tangent of the normal? @6:17. What is he saying here?

[@adibmukhlis5256]

im sorry, can someone explain to me..why cant i just make the sqrt(25-x^2) into 5-x?..it is the same thing? right?

[@pedrov8868]

Hi, you can just think of sqrt((a+b)^2). (a+b)^2 if you expand is a^2+2ab+b^2 which is not the same as a^2+b^2 (see binomial theorem). This is why we can't just take the square root of each variable inside of the sqrt function individually.

[@pedrov8868]

Hope this makes sense, let me know if it didn't.

[@adibmukhlis5256]

@@pedrov8868 yeah..i just realized that😅 thanks

[@rafaellisboa8493]

oh my'(x)