Limit Definition:
f(x)=2x-3x2
lim h -> 0
2-3x
lnx
f(x)=lnx
1/x
second derivative of a function:
f(x)=3x4-4x3
36x2-24x
related rates
A pebble is dropped in a pool of water causing ripples in the form of concentric circles. The radius r of the outer ripple is increasing at a constant rate at 1 ft per sec. when the radius is 4ft at what rate is the total area A of the distributed water changing.
8pi ft per sec
indefinite integrals
s(t)=/(3t2-6t+2)dt
s(t)=t3-3t2+2t+C
Power Rule:
f(x)=5x4+10x2
60x5
ex
f(x)=x3(e-2x)
3x2e-2x-(2x3e-2x)
slope at a point
find the slope of f(x)=sinx where x=π/4
21/2/2
marginal profit
A company manufactures widgets and the total cost c(x) in dollars associated with producing x widgets is given by c(x)=500+10x+0.1x2. The revenue from selling x widgets is given by r(x)=15x-0.05x2. Find marginal profit when 100 widgets are procured and sold.
-25
definite integral
/(1 to -1) (x+1)/(x2+2x+2) dx
6/25
f(x)=5x2(2y4)
20xy4
sinx
f(x)=sinx
cosx
equation of tangent line
f(x)=3x3-5x2+2x+1, x=2
y-9=18(x-2)
velocity
At time t=0 a diver jumps from a diving board that is 32ft high. the divers initial velocity is 16ft per sec so the position of the diver is given by S=16t2+16t+32. when does the diver hit the water?
2
integration by substitution
/x4(x5-9)3dx
1/20 (x5-9)4+C
Chain Rule
f(x)=(7x2+5x)5
5(7x2+5x)4(14x+5)
cosx
f(x)=3/4cosx
-3/4sinx
equation of normal line
f(x)=4-x2 at x=1
y-3=1/2(x-1)
first derivative test
f(x)=x2-4x+5
dec(-infinity, 2), inc (2, infinity), min(2, 1)
optimization
make an open box that has a square base and surface area of 108 in2. find the dimensions that will produce a box with max volume.
height: 3 inches
width: 6 inches
Quotient Rule
f(x)=(3x2+6x+10)/4x2
-24x2-80x
Combination of Product and Chain Rules
f(x)= (12x2+7x)2(4x+6)
implicit differentiation
3x2-y=5x
6x-5
second derivative test
f(x)=2x3-12x2
concave down (-infinity, 2), concave up (2, infinity), poi (2, 32)
Riemann's sum
find the area under the curve from [-2, 2] for the equation f(x)=-|x|+3 from the left side. use 4 rectangles.
8