Daylight function for 40° N Verify that the function D ( t ) = 2.8 sin ( 2 π 365 ( t − 81 ) ) + 12 has the following properties, where t is measured in days and D is the number of hours between sunrise and sunset. a. It has a period of 365 days. b. Its maximum and minimum values are 14.8 and 9.2, respectively, which occur approximately at t = 172 and t = 355, respectively (corresponding to the solstices). c. D (81) = 12 and D (264) ≈ 12 (corresponding to the equinoxes).
Daylight function for 40° N Verify that the function D ( t ) = 2.8 sin ( 2 π 365 ( t − 81 ) ) + 12 has the following properties, where t is measured in days and D is the number of hours between sunrise and sunset. a. It has a period of 365 days. b. Its maximum and minimum values are 14.8 and 9.2, respectively, which occur approximately at t = 172 and t = 355, respectively (corresponding to the solstices). c. D (81) = 12 and D (264) ≈ 12 (corresponding to the equinoxes).
Daylight function for 40° N Verify that the function
D
(
t
)
=
2.8
sin
(
2
π
365
(
t
−
81
)
)
+
12
has the following properties, where t is measured in days and D is the number of hours between sunrise and sunset.
a. It has a period of 365 days.
b. Its maximum and minimum values are 14.8 and 9.2, respectively, which occur approximately at t = 172 and t = 355, respectively (corresponding to the solstices).
c.D(81) = 12 and D(264) ≈ 12 (corresponding to the equinoxes).
EXAMPLE 3
Find
S
X
√√2-2x2
dx.
SOLUTION Let u = 2 - 2x². Then du =
Χ
dx =
2- 2x²
=
信
du
dx, so x dx =
du and
u-1/2 du
(2√u) + C
+ C (in terms of x).
Let g(z) =
z-i
z+i'
(a) Evaluate g(i) and g(1).
(b) Evaluate the limits
lim g(z), and lim g(z).
2-12
(c) Find the image of the real axis under g.
(d) Find the image of the upper half plane {z: Iz > 0} under the function g.
k
(i) Evaluate
k=7
k=0
[Hint: geometric series + De Moivre]
(ii) Find an upper bound for the expression
1
+2x+2
where z lies on the circle || z|| = R with R > 10. [Hint: Use Cauchy-Schwarz]
Chapter 1 Solutions
Single Variable Calculus: Early Transcendentals (2nd Edition) - Standalone book
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