Midterm - Terms to Know Flashcards

1
Q

instantaneous velocity

A

lim(h–>0) of [f(x1 + h) - f(x)]/h

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2
Q

lim(x–>0) of sinx/x

A

1

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3
Q

lim(x–>inf.) of sinx/x

A

0

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4
Q

lim(x–>c) of A

A

A

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5
Q

lim(x–>c) of x

A

c

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6
Q

lim(x–>c) of [f(x) +/- g(x)]

A

lim(x–>c) of f(x) +/- lim(x–>c) of g(x)

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7
Q

lim(x–>c) of [kg(x)]

A

k*lim(x–>c) of g(x)

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8
Q

lim(x–>c) of [f(x)^n]

A

[lim(x–>c) of f(x)]^n

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9
Q

Sandwich Theorem

A

if g(x) </= f(x) </= h(x) in some interval about c, and lim(x–>c) of g(x) = lim(x–>c) of h(x), then lim(x–>c) of f(x) = L

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10
Q

a function is continuous if…

A

the value exists
the limit exists
the limit equals the value

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11
Q

intermediate value theorem

A

if a function is continuous between points a and b, it will take on every value between f(a) and f(b)

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12
Q

tangent line equation

A

ytan = m(x-x1) + y1

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13
Q

what is a normal line?

A

a line perpendicular to the tangent line; has the opposite reciprocal slope

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14
Q

when is a function differentiable?

A

if it has a derivative at every point in its domain, and is both continuous and smooth

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15
Q

power rule

A

d/dx(x^n) = nx^(n-1)

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16
Q

constant multiple rule

A

d/dx(cu) = c*d/dx(u)

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17
Q

sum and difference rule

A

d/dx(u +/- v) = du/dx +/- dv/dx

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18
Q

product rule

A

d/dx(uv) = du/dxv + dv/dxu

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19
Q

quotient rule

A

“low d high minus high d low, square the bottom and away we go”
d/dx(u/v) = (du/dxv - dv/dxu)/v^2

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20
Q

position, velocity, acceleration relationships

A

velocity is the first derivative of position
acceleration is the first derivative of velocity and second derivative of position

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21
Q

velocity and acceleration

A

when velocity is + or - but increasing, acceleration is +
when velocity is constant, acceleration is 0
when velocity is decreasing, acceleration is -

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22
Q

d/dx(sinx)

A

cos(x)

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23
Q

d/dx(cosx)

A

-sin(x)

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24
Q

d/dx(tanx)

A

sec^2(x)

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25
Q

d/dx(secx)

A

secxtanx

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26
Q

d/dx(cscx)

A

-cscxcotx

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27
Q

d/dx(cotx)

A

-csc^2x

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28
Q

chain rule

A

dy/dx = dy/du * du/dx
y’ = f’(g(x)) * g’(x)

29
Q

inverse functions

A

derivative of a function’s inverse is the reciprocal of that function’s derivative

30
Q

d/dx(sin-1x)

A

1/(rt[1-x^2])

31
Q

d/dx(cos-1x)

A

-1/(rt[1-x^2])

32
Q

d/dx(tan-1x)

A

1/(1+x^2)

33
Q

d/dx(cot-1x)

A

-1/(1+x^2)

34
Q

d/dx(secx)

A

1/(|u|*rt[u^2-1])

35
Q

d/dx(cscx)

A

-1/(|u|*rt[u^2-1])

36
Q

d/dx(e^x)

A

e^x

37
Q

d/dx(lnx)

A

1/x

38
Q

extreme value theorem

A

if f is continuous over a closed interval, then f also has a maximum and a minimum value over that closed interval, including at its endpoints
–> maximum/minimum are where f’ = 0

39
Q

first derivative test

A

extrema exist where f exists and f’ changes signs (+ –> - or - –> +)
neg. to pos.: minimum
pos. to neg.: maximum

40
Q

mean value theorem

A

if f(x) is continuous over [a, b] and differentiable over (a, b), then at some point c between a and b, f’(c) = (f(b)-f(a))/(b-a)

41
Q

increasing/decreasing functions

A

increasing if: when x1 < x2, f(x1) < f(x2)
decreasing if: when x1 < x2, f(x1) > f(x2)

42
Q

antipower rule

A

if f(x) = ax^n, F(x) = (a/([n+1])x^(n+1)

43
Q

curve sketching

A

concave up: when f ‘’ (x) > 0
concave down: when f ‘’ (x) < 0

concave up/increasing: f’ > 0, f ‘’ > 0
concave up/decreasing: f’ < 0, f ‘’ > 0
concave down/increasing: f’ > 0, f ‘’ < 0
concave down/decreasing: f’ < 0, f ‘’ < 0

44
Q

related rates tip

A

find the rate at which one quantity is changing by relating it to other quantities, whose rates of change are known
1. draw a picture
2. write down what you know and what you’re looking for
3. write an equation relating knowns and unknowns
4. take derivative, usually with respect to time (t)
5. solve (by plugging in what you know) and interpret the answer

45
Q

rectangle/square formulas

A

P = 2l + 2w
A = lw

46
Q

parallelogram formulas

A

P = 2a + 2b
A = bh (h = height, not side length)

47
Q

triangle formulas

A

P = a + b + c
A = (1/2)bh

48
Q

trapezoid formulas

A

P = a1 + a2 + b1 + b2
A = (1/2)h(b1 + b2)

49
Q

circle formulas

A

P = 2pir
A = pi
r^2

50
Q

rectangular prism formulas

A

V = lwh
SA = 2lw + 2lh + 2wh

51
Q

cone formulas

A

V = (1/3)pir^2h
SA = pi
r^2 + pi*rs (s = length of side)

52
Q

sphere formulas

A

V = (4/3)pir^3
SA = 4pi
r^2

53
Q

pyramid formulas

A

V = (1/3)(ab)h
SA = (1/3)(2a + 2b)(s)(ab)
where s = height of triangle face

54
Q

cylinder formulas

A

V = pir^2h
SA = 2pi
r^2 + 2pi*rh

55
Q

linearization of f at a

A

L(x) = f(a) + f’(a)(x-a)

56
Q

Newton’s method

A

used to find approximate roots of equations using linearizations
1. find function & derivative –> take a guess at a root, then find the linearization of the curve at that point, where L(x) = 0
2. use x-value found from linearization to guess again; x(n+1) = xn - (f[xn]/f’[xn])
3. find where x stops changing

57
Q

optimization steps

A
  1. draw scenario
  2. write equation for quantity you want to optimize in terms of one variable
  3. find first derivative of equation and set equal to 0
  4. check endpoints if necessary
58
Q

approximation methods for integrals

A

LRAM: A = h(y0 + y1 + y2 + y3) where y-values are from left corner
RRAM: A = h(y1 + y2 + y3 + y4) where y-values are from right corner
MRAM: A = h(y0.5 + y1.5 + y2.5 + y3.5)

59
Q

calculating area under the curve - definite integral notation

A

lim(n–>inf.) of the sum of all f(ck)(delta of x) = intg. from b –> a of (f(x)dx)

60
Q

integral evaluation theorem

A

intg. from b–>a of (f(x)*dx) = F(b) - F(a)

61
Q

rules for integrals

A

reversing limit changes the sign (+/-)
if upper and lower limits are equal, area = 0
constant multiples can be moved outside
integrals can be added/subtracted
intervals can be added/subtracted
neither integrals nor intervals can be multipled/divided

62
Q

mean value theorem for intervals

A

1/(b-a) * intg. from b–>a of (f(x)*dx)

63
Q

fundamental theorem

A

d/dx of (intg. from x–>a of f(t)*dt) = f(x)
need parameters:
- derivative of integral
- derivative matches upper limit of integration (d/dx matches x)
- lower limit is a constant (a)
*integral can be rearranged to suit these parameters

64
Q

trapezoidal rule

A

T = (h/2)(y0 + 2y1 + 2y2…+2y(n-1) + yn)

65
Q

Simpson’s Rule

A

T = (h/3)(y0 + 4y1 + 2y2 + 4y3…+2y(n-2) + 4y(n-1) + yn)

66
Q

integration by parts formula

A

intg. of (udv) = uv - intg. (vdu)
u must differentiate to 0, dv must be easy to integrate
*choose u using LIPET

67
Q

tabular integration works for…

A

integrals of the form intg. (f(x) * g(x)*dx), where f(x) differentiates to 0 and g(x) integrates forever

68
Q

slope fields

A

if x is affecting, change horizontally
if y is affecting, change vertically