Worked example: Derivative of cos_(x) using the chain rule | AP Calculus AB | Khan Academy

[@KuntaKinte0.0]

Man... this just keeps getting better and better!! I'm 16, and I'm grasping calculus concepts! This helps fuel my love for math, Sal. Thanks for concretizing my knowledge. I truly enjoy your math and physics videos!

[@adamsammartino6979]

that moment when the internet teaches you more cal in one night than youve learned in 2 months with your teacher

[@TotanDas1991]

this is the best explanation of the chain rule. thanks, Sal.

[@LouisDuran]

How the heck does this guy write so neatly with a mouse!? I try to write math equations using my mouse and it looks like badly drawn "art"

[@amitai8204]

thank you!! perfectly explained

[@janakamohotti]

excellent explanation!!! thanks Sal!

[@s_yaparov]

I am probably the only guy who didn’t understand...

[@fatihcemalcan3280]

Nice explanation

[@yingkelly9095]

It's very very very helpful.

[@jannatoitri6692]

this is what I was looking for.

[@CrayonAnarchy]

Thanks

[@chamelious]

Don't understand the last step- Why aren't you just writing the 2 terms in order like you explained all the way through? 3(cosx)squared times -sinx...? Where does negative three come from?

[@siddharthchenrayan5000]

It's just a nicer way of writing it. Technically you could leave it as "3(cosx)squared times -sinx", but going that one extra step to simplify it is often what's expected on MC or free response questions.

[@kanji81089]

💯💯💯

[@dropthatashe]

I know he tried to explain it multiple times, but please finish out one thought before jumping into another way to "look" at things. I am trying to figure out whats what and you showing 3 different ways to do it when I am new at this.....welll i am even more confused. Idk how people are saying they understood this video LOL

[@aroncastillo4351]

made it more confusing

[@radha4790]

... your mind ugh

[@doods696]

stop differing the COLORS !! that's so distracting !