For Exercises 31-42, given complex numbers z 1 and z 2 , a. Find z 1 z 2 and write the product in polar form. b. Find z 1 z 2 and write the quotient in polar form. (See Example 5-6) z 1 = 3 4 cos π 12 + i sin π 12 , z 2 = 1 12 cos 5 π 12 + i sin 5 π 12
For Exercises 31-42, given complex numbers z 1 and z 2 , a. Find z 1 z 2 and write the product in polar form. b. Find z 1 z 2 and write the quotient in polar form. (See Example 5-6) z 1 = 3 4 cos π 12 + i sin π 12 , z 2 = 1 12 cos 5 π 12 + i sin 5 π 12
Solution Summary: The author calculates the complex numbers z_1cdot2 in polar form.
For Exercises 31-42, given complex numbers
z
1
and
z
2
,
a. Find
z
1
z
2
and write the product in polar form.
b. Find
z
1
z
2
and write the quotient in polar form. (See Example 5-6)
z
1
=
3
4
cos
π
12
+
i
sin
π
12
,
z
2
=
1
12
cos
5
π
12
+
i
sin
5
π
12
Combination of a real number and an imaginary number. They are numbers of the form a + b , where a and b are real numbers and i is an imaginary unit. Complex numbers are an extended idea of one-dimensional number line to two-dimensional complex plane.
In each of Problems 1 through 4, draw a direction field for the given differential equation. Based on the direction field, determine the behavior of y as t → ∞. If this behavior depends on the initial value of y at t = 0, describe the dependency.1. y′ = 3 − 2y
B 2-
The figure gives four points and some
corresponding rays in the xy-plane. Which of
the following is true?
A
B
Angle COB is in standard
position with initial ray OB
and terminal ray OC.
Angle COB is in standard
position with initial ray OC
and terminal ray OB.
C
Angle DOB is in standard
position with initial ray OB
and terminal ray OD.
D
Angle DOB is in standard
position with initial ray OD
and terminal ray OB.
temperature in degrees Fahrenheit, n hours since midnight.
5. The temperature was recorded at several times during the day. Function T gives the
Here is a graph for this function.
To 29uis
a. Describe the overall trend of temperature throughout the day.
temperature (Fahrenheit)
40
50
50
60
60
70
5
10 15 20 25
time of day
b. Based on the graph, did the temperature change more quickly between 10:00
a.m. and noon, or between 8:00 p.m. and 10:00 p.m.? Explain how you know.
(From Unit 4, Lesson 7.)
6. Explain why this graph does not represent a function.
(From Unit 4, Lesson 8.)
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