Thank you so much for this!

-Sasha ]]>

Also, Grant Sanderson conveys the geometric explanation for the derivative of sin(x) in his new Essence of Calculus, Volume 3: https://youtu.be/S0_qX4VJhMQ

]]>http://intellectualmathematics.com/calculus/

and my associated rants against the standard approach, such as:

http://intellectualmathematics.com/blog/down-with-the-definition-of-the-derivative/ ]]>

I have a series of “calculus without tears, or limits” which uses geometry and I am sending you the links:

https://howardat58.wordpress.com/2014/08/19/calculus-without-tears-that-is-without-limits/

and four more.

]]>Do you agree, at least, that there’s no need to require a tangent line at a POI?

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