The Product Rule for Derivatives

JenGutierrez28 Says:

Mar 3, 2012 - Thank you! You make it REALLY easy! My textbook COMPLETELY threw me off! Thanks! :)

Sneakydud2 Says:

Mar 3, 2012 - This is just a rule that some asshole proved right like 500 years ago or smthing like that and made us learn in school today. So you dont really need to prove it again, u just gotta remember the formula.

karla011302 Says:

Mar 4, 2012 - Patrick you are the bomb!!!!!!!!!!!!!! THANK YOU

1soldier24 Says:

Mar 6, 2012 - this helps alot Thanks

DarkSideZombie0 Says:

Mar 7, 2012 - this helps. thanks

ablovele Says:

Mar 13, 2012 - Just to clarify, why is cosx the derivative of sinx and vice versa? Does this go back to a trig rule/formula/unti circle graph I've forgotten or does it become clear if I was to graph the derivative of sinx or cosx?

stwengther Says:

Mar 13, 2012 - Maths is like a foreign language, and I'm shit at languages.

Ibeatyou23 Says:

Mar 17, 2012 - Thanks Dude, super clear.

Sajani1995 Says:

Mar 18, 2012 - Hi, Can you help me to do this sum?y= sin 3x e^2xI dont understand what to do after I use product ruleThank you

diamond3187 Says:

Mar 18, 2012 - -sinx is the derivative of cosx (not +sinx)... it can be proved using first principles e.g. that equation involving h and limits... search for 'proof sinx = cosx' , theres a video

Spadille1 Says:

Mar 19, 2012 - I always come here like an hour before my midterm :)

cnestudy Says:

Mar 25, 2012 - what if i have four terms. could i group 3 and leave one out or could i group them so i could have 2 groups.

cnestudy Says:

Mar 25, 2012 - neverminiiind!! i didnt finish watching the vid

tonydeadlock Says:

Mar 27, 2012 - lol you are not alone i understand him and can do his problems but i fail all my school stuff ?_? 

peteyhopkin Says:

Mar 29, 2012 - cheers mate! helping me witih my engineering maths at uni !!

dascoolman13 Says:

Apr 14, 2012 - thankyou!

Arenas49ers Says:

Apr 16, 2012 - Thank you so much! You explain this so much better than my professor!

JBHaugaard Says:

Apr 25, 2012 - Where you have (Cos x)(Cos x) + (Sin x)(-Sin x) is this not 1 using the fact that = Cos^2 (x) - Sin^2 (x) = 1 (unit circle)

karzmaniac Says:

May 7, 2012 - i love how this guy is such a gentleman. always apologizing if he moves the paper slightly and saying "excuse me" after he coughs a little. just makes this much more enjoyable to learn from. bravo sir bravo.

HiddenLotus9 Says:

May 10, 2012 - Indeed.

HiddenLotus9 Says:

May 10, 2012 - You missed the x^2 at 2:40

HiddenLotus9 Says:

May 10, 2012 - Differentiating sin gives you cos. Differentiating cos gives you -sin. You differentiate one side first and leave the other side alone, and the leave the first side alone while differentiating the second side.

alexriesenbeck Says:

May 15, 2012 - Very informative. Aqua Tremlet, Fire Tremlet. Franel is Chonder, and Chonder is matter, derivative. BexN Math Division 2013 (C)

RedeemedNchosen Says:

May 29, 2012 - How exactly do you get the derivatives? You keep saying "okay, i'll take the derivative of".....and so on, but I don't understand how you got those numbers. The x^2 to 2x kind of makes sense. But I have no idea how you got the 3x^2.