2.1-2.5 quiz Flashcards

1
Q

sin x ‘

A

cos x

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2
Q

cos x’

A

-sin x

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3
Q

tan x’

A

sec^2 x

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4
Q

cot x

A

-csc^2 x

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5
Q

sec x’

A

sec x(tan x)

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6
Q

csc x’

A

-csc x(cot x)

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7
Q

product rule

h(x) = f(x)(g(x))

A

h’(x) = f x g’ + g x f’

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8
Q

quotient rule

h(x) = f(x)/g(x)

A

h’(x) = g x f’ - f x g’ / g^2

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9
Q

chain rule

h(x) = f(g(x))

A

think like peeling an onion

h’(x) = f’(g(x)) x g’(x)

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10
Q

sin 2x

A

2sinxcosx

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11
Q

consider the curve : formula

show that dy/dx equals formula

A

basically dy/dx is the formula of the curve

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12
Q

what is differentiation

A

where the slope equals the tangent line

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13
Q

the process of finding a derivative is called

A

differentiation

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14
Q

what does differentiability imply

A

continuity

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15
Q

the derivative doesn’t exist at

A

discontinuities
cusps
when the tangent becomes vertical(straight up and down line part)

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16
Q

power rule

d/dx[x^n] =

17
Q

power rule on constants

d/dx 5

18
Q

find equation of tangent line to graph of f(x) at the point(x,y)

how to solve

A

find derivative of f(x) to solve for the slope at any point on the function

then plug in (x,y) to find the slope for that particular point

19
Q

implicit differentiation procedure

A

differentiate each term with respect to x (dy/dx)

nivel all terms contains dy/dx to the left side of the equation and all other terms to the right side

factor out dy/dx on left side of equation

solve for dy/dx

20
Q

product vs chain tule for trig functions:

A

if the angle theta is just x it is product rule; if it is 2x however or (2x-1) whether it has parentheses or not it is chain rule

21
Q

what happens to the “y” with implicit differentiation

A

it becomes dy/dx

with respect to x

22
Q

what happens to x in implicit differentiation

A

nothing with respect to x becomes 1 so the x is left alone

23
Q

L’hospitsl rule

How to wrote AP TESTA ND FRQ

A

1) show f(x) and g(x) are continuos and differentiable
(Write f(x) and g(x) separately!)

2) show lim f(x) = 0 and lim g(x) = 0
x->a x-> a
3) using L’Hospitals rule
lim f(x)/ g(x) = lim f’(x)/g’(x) plug in number
x->a x-> a

24
Q

L’hospital rule idea

A

If in indeterminate form find derivative of og equation and replug in pts, if still indeterminate keep finding derivatives

25
finding second derivative
determine what is f(x) and g(x) and f’(x) and g’(x) [still use implicit differentiation plug in dy/dx] then solve for the dy/dx (it equals previous derivative D’)
26
derivative of “xy”
use product rule (x*dy/dx + y*1) keep subtraction sign outside of parentheses and distribute once finished differentiating
27
constant on right side of equal sign
don’t forget to differentiate it!! equals 0
28
how to write second differentiation in (dy/dx) format
d^2y/dx^2 ??
29
when solving any typa derivative problem
first identify and write down f(x), f’(x), g(x), g’(x) then identify what rule to use and write that down write down formula for rule too if needed
30
differentiation of 4xy
group (4x) as f(x) and (y) as g(x) becuase 4 is only multiplied to the y(not distributed to the whole thing)
31
when doing implicit differentiation only put derivatives on y when
differentiating for y for example in product rule where f(x)*g’(x) if f(x) = y DONT put dy/dx becuase u aren’t supposed to find the derivative of f(x) differentiating is ONLY used when u need to find the derivative of THAT PARTICULAR variable
32
is cos^2(x) composite
yes inner function: cos(x) outer function: x^2
33
derivative of sec(4x)
sec(4x)tan(4x)*4
34
trig function inside of trig function means how many parts of an onion
3 layers of onion
35
``` lim f(x+h) -f(x)/ x-h x->h ``` identify derivative of f(x) @ any point
derivative of f(x) @ any point is the derivative upper right part of the fraction f’(x)
36
instantaneous rate of change
find derivative | then plug in point
37
average rate of change
f(b)-f(a)/ b-a