calculus ab & bc drill on derivatives!!!!!!!!!! by susan e. cantey walnut hills h.s. 2006
TRANSCRIPT
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Calculus AB & BCDrill on Derivatives!!!!!!!!!!
By Susan E. Cantey
Walnut Hills H.S.
2006
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Derivative Drill & Practice
• I’m going to ask you to remember some derivatives.
• It’s important to be fast as time is your enemy on the AP Exam.
• When you think you know the answer,
• (or if you give up ) click to get to the next slide to see if you were correct.
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What’s the definition of ?
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There’s 2 of them!
You really need to know both of these thoroughly!
𝑓 ′ (𝑐 )=limh→ 0
𝑓 (𝑐+h )− 𝑓 (𝑐)h
𝑓 ′ (𝑐 )=lim𝑥→𝑐
𝑓 (𝑥 )− 𝑓 (𝑐)𝑥−𝑐
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What’s the definition of ?
This is a bit different…instead of the limit being a number…it will be a function related to f(x)
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Got it??
Notice that in the second definition, the arrow points to the independent variable in the final answer.
𝑓 ′ (𝑥 )=limh→ 0
𝑓 (𝑥+h )− 𝑓 (𝑥 )h
𝑓 ′ (𝑥 )=lim𝑡→𝑥
𝑓 (𝑥 )− 𝑓 (𝑡)𝑥−𝑡
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What does the derivative, tell you about ?
(There are many answers…
how many do you know?)
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Here’s a few:
Slope of the curve
Instantaneous rate of change in f(x)
Rate of change
If f(x) is position…then velocity
If f(x) is velocity…then acceleration
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Now…
Here come a series of questions
concerning basic derivatives you should
know very quickly!
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Ready?
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d/dx(sin(x)) = ??
• What’s your answer?
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cos(x)
• Were you right?
(click for next question)
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d/dx(mxn)
• What’s your answer?
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mnxn-1
• Were you right?
(click for next question)
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d/dx(ef(x))
• What is your answer?
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𝑓 ′(𝑥 )𝑒 𝑓 (𝑥 )
• Were you right?
(click for next question)
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d/dx(ln|x|)
• What is your answer?
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1/x
• Were you right?
(click for next question)
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d/dx(ax)
• What’s yer answer…eh?
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(ln a) ax
• Were you right?
(click for next question)
I dig this calculus stuff!!
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d/dx (logax)
• What’s your answer?
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Aghh! Never can remember this one!!!
Do it this way: logax = ln x / ln a (ln a is just a constant)
so the answer is
Ready?
1𝑥𝑙𝑛𝑎
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d/dx(cos x)
• What’s your answer?
(yeah yeah yeah…back to trig!)
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- sin x
• Did you remember the “-” ??
Were you right?
(click for next question)
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d/dx(tan x)
• Answer it baby!!
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sec2x
• Were you right?
(click for next question)
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d/dx(cot x)
• The ugly step sister!
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- csc2x
• Ya ya ya!!• Were you right?
(click for next question)
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d/dx(sec x)
• I call this one the wart derivative!
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sec x tan x
• Were you right?
(click for next question)
(It’s the TRIG family!!)
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d/dx(csc x)
• Get ‘er done!!!
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- csc x cot x
• I think there’s a pattern, eh?
(click for next question)
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d/dx(ln f(x))
•Ready?
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𝑓 ′(𝑥 )/ 𝑓 (𝑥)• Were you right?
(click for next question)
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d/dx (af(x))
• Go go go go!!!!!
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af(x)
• Were you right?
(click for next question)
Hit that ball!!
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d/dx (tan-1x)
• Oh yeah! Inverse trig mama!
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1/(1+x2)
• Were you right?
(click for next question)
It’s not raining is it?
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d/dx(sin-1x)
You can do this one in your sleep!
RIGHT?
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Did ya get it??
• Let’s keep going!!!
21
1
x
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d/dx(cos-1x)
• If you new the last one, ya know this one…….right??
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Oh yeah!
21
1
x
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d/dx(sec-1x)
• This one’s a bit harder….
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Dah dah!!!
Did you know that one??
1
¿ 𝑥∨√𝑥2−1
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d/dx(|x|)
• This one is a bit esoteric…
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If you knew it was
x
x ||
BPROUD of ya!
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d/dx(f(x)g(x))
• It’s the Product Rule!
• (don’t flush it!!!)
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𝑓 (𝑥)𝑔 ′ (𝑥)+𝑔(𝑥) 𝑓 ′(𝑥 )Yeah…I know you know it…but I’m afraid…
Promise me you will remember to use the product rule every time you take the derivative of a
product! OK??
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d/dx(f(x)/g(x))
It’s the merry mighty Quotient Rule!!
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Pleeeezzze!Don’t get the numerator backwards.
𝑔 (𝑥 ) 𝑓 ′ (𝑥 )− 𝑓 (𝑥 )𝑔 ′(𝑥 )[𝑔 (𝑥 )]2
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d/dx(f(g(x)))
Chain chain chain….
Chain of love!
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Yeah yeah…you’re good now…
But what about that first week of May?
Don’t forget all three steps!1) Deriv of outside 2) Copy inside3) Multiply by the “baby”
)('))((' xgxgf
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d/dx(y)
Are you confused yet?
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dy/dx
• Did I trick you ?
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d/dx(xx)
• Hmmmmm….
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Ha ha…I did trick you!
Variable to a variable power - you can’t do it…unless you take the natural log first…
y = xx
ln y = x ln x
(1/y)(dy/dx)=x(1/x)+ 1lnx
dy/dx = y(1+lnx)
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OK…switching to Related Rates
For the rest of the questions, pretend you are doing a related rates problem.
That is…”t” is the independent variable…
For each expression, give the derivative as you would in a Related Rates problem.
Here we go!!!
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y
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dy/dt
Ready to proceed?
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Here’s a harder one:
2r
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Did ya get it??
dr/dt is the “baby”…r is the “mama”
)(2 dtdrr
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xy
Don’t be fooled!!!!
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Ya Ya…Product Rule!!
You promised you would not forget!
x (dy/dt) + y (dx/dt)
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sin x
Whoo whoo dee whoo!!
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(cos x) (dx/dt)
Well…did you remember there was a baby?
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Last one!
Don’t mess up!
y2
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(2y)(dy/dt)
Yeah! That’s it for derivatives!
Run this power point again if you are not 100% certain you have mastered
derivatives!
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Goodbye!
Be sure to run the other four power points for :
1) Integrals 2) Miscellaneous Topics
3) Sequences and Series 4) Other BC Topics