Parametric descriptions Give a parametric description of the form r ( u , v ) = 〈 x ( u , v ) , y ( u , v ) , z ( u , v ) 〉 for the following surfaces. The descriptions are not unique. Specify the required rectangle in the uv-plane . 15. The portion of the cylinder x 2 + y 2 = 9 in the first octant, for 0 ≤ z ≤ 3
Parametric descriptions Give a parametric description of the form r ( u , v ) = 〈 x ( u , v ) , y ( u , v ) , z ( u , v ) 〉 for the following surfaces. The descriptions are not unique. Specify the required rectangle in the uv-plane . 15. The portion of the cylinder x 2 + y 2 = 9 in the first octant, for 0 ≤ z ≤ 3
Solution Summary: The author explains the parametric description of a cylinder x2+y 2=9 at the first octant.
Parametric descriptionsGive a parametric description of the form
r
(
u
,
v
)
=
〈
x
(
u
,
v
)
,
y
(
u
,
v
)
,
z
(
u
,
v
)
〉
for the following surfaces. The descriptions are not unique. Specify the required rectangle in the uv-plane.
15. The portion of the cylinder x2 + y2 = 9 in the first octant, for 0 ≤ z ≤ 3
Given lim x-4 f (x) = 1,limx-49 (x) = 10, and lim→-4 h (x) = -7 use the limit properties
to find lim→-4
1
[2h (x) — h(x) + 7 f(x)] :
-
h(x)+7f(x)
3
O DNE
17. Suppose we know that the graph below is the graph of a solution to dy/dt = f(t).
(a) How much of the slope field can
you sketch from this information?
[Hint: Note that the differential
equation depends only on t.]
(b) What can you say about the solu-
tion with y(0) = 2? (For example,
can you sketch the graph of this so-
lution?)
y(0) = 1
y
AN
(b) Find the (instantaneous) rate of change of y at x = 5.
In the previous part, we found the average rate of change for several intervals of decreasing size starting at x = 5. The instantaneous rate of
change of fat x = 5 is the limit of the average rate of change over the interval [x, x + h] as h approaches 0. This is given by the derivative in the
following limit.
lim
h→0
-
f(x + h) − f(x)
h
The first step to find this limit is to compute f(x + h). Recall that this means replacing the input variable x with the expression x + h in the rule
defining f.
f(x + h) = (x + h)² - 5(x+ h)
=
2xh+h2_
x² + 2xh + h² 5✔
-
5
)x - 5h
Step 4
-
The second step for finding the derivative of fat x is to find the difference f(x + h) − f(x).
-
f(x + h) f(x) =
= (x²
x² + 2xh + h² -
])-
=
2x
+ h² - 5h
])x-5h) - (x² - 5x)
=
]) (2x + h - 5)
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University Calculus: Early Transcendentals (4th Edition)
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