Today's objectives:
1. Identify if a graph represents a periodic function.
2. Determine period, amplitude and midline.
3. Use a graph to find and interpret y if given t or vice
versa.
Prepare for QUIZ 1 next Wednesday, Sept 4 over prerequisite skills.
(See green packet and eHW.)
Due
Friday, August 30, 11:59 pm:
E-HW: Quiz on John's Syllabus- Score 90% or Higher by the Deadline! Note: You need to get a score of 90% or higher for this eHW by the
deadline to open up any future eHW assignments.
You have unlimited attempts.
Due Tuesday, Sept 3, 11:59 pm:
E-HW: Math Background Needed for MA 15400 Due Tuesday, Sept 3, 11:59 pm:
E-HW0: General Course
Information and Using eHW
Wednesday,
August 28
Section 7.2
The Sine Function
(and its Sidekick, Cosine)
Today's objectives:
Sketch the position of a point on a circle of radius r
corresponding to a given angle (or value of time or number of
revolutions) and give its coordinates
Find angles between 0° and 360° which have the same sine or cosine of a given angle.
Determine in which quadrant an angle lies if given
certain conditions.
Do (for practice): Flash
Card 7.2 Report the coordinates of a point on a circle of radius r given
the angle. Flash Card
7.2 Use the definitions of sine and cosine
If you have a text, see read Section
7.3
and do Section7.2--
1, 3, 5-31
Click on the photo to enlarge (and download for
printing).
Prepare for QUIZ 1 next Wednesday, Sept 4 over prerequisite skills.
(See the
green packet
with
KEY and eHW Flash Cards for practice.)
Due
Friday, August 30, 11:59 pm:
E-HW: Quiz on John's Syllabus- Score 90% or Higher by the Deadline! Note: You need to get a score of 90% or higher for this eHW by the
deadline to open up any future eHW assignments.
You have unlimited attempts.
Due Tuesday, Sept 3, 11:59 pm:
E-HW: Math Background Needed for MA 15400 Due Tuesday, Sept 3, 11:59 pm:
E-HW0: General Course
Information and Using eHW
Friday
August 30
Section 7.3
Radians
Today's objectives:
Convert an angle from degrees to radians and vice versa.
Interpret the radian measure of the central angle of a
circle of radius r as the number of radius lengths, r,
that you need to wrap around the rim of the circle on the arc
spanned by the angle.
Understand the relationship between arc length, radius and
an angle measure in radians.
If given two of the arc length s, radius r, or an
angle θ, find the third.
The radian measure of an angle θ is the number of radius
lengths that a bug would walk on the rim of a circle spanned by the
angle.
For a circle of radius r, if s is the arc length
the bug walks on the rim, then we have s = (the radius r)
x (# of radius lengths) or s = r
x θ
Here is a short video
of the bug taking a tour around the rim of a circle,
counting radius lengths as he goes. It is a silent movie since bugs can't talk.
Suppose a central angle θ in a circle
of radius r spans an arc of length s. Measure how
many radius lengths that the length of the arc is. This number of
radius lengths is the radian measure of the angle θ: we
have rθ = s.
Do (for practice): Flash Card 7.3 Find points on a circle using radian
measure of quadrantals
Flash Card 7.3 Radian Measure as Number of Radius Lengths Around
a Circle
If you have a text, read
Chapter 7 Skills Refresher,
see Section 7.3 -- 1-56 as desired (for practice).
Prepare for QUIZ 1 next Wednesday, Sept 4 over
prerequisite skills.
(See the
green packet
with
KEY and eHW Flash Cards for practice.)
Due Tuesday, Sept 3, 11:59
pm: E-HW: Math Background Needed for MA 15400 Due Tuesday, Sept 3, 11:59
pm: E-HW0: General Course Information and Using eHW
Due Friday, Sept. 6, 11:59 pm:E-HW
01 Sections 7.1 - 7.2 Due Wednesday, Sept. 11, 11:59 pm:E-HW
01 Sections 7.3
Class meeting
Topic
Assignment
Mon, Sept. 2
Labor day holiday
No class meeting
Wed., Sept. 4
Chapter 7 Skills Refresher Special Angles
Today: QUIZ 1 over Prerequisites. We briefly looked at special
angles
Do (for practice):
Flash Card
Ch 7 Skills Refresher
Properties of Special Triangles
Flash Card
Ch 7 Skills Refresher
Exact Values of Sine and Cosine
If you have a text, see
Chapter 7
Skills Refresher (page 325) -- 25-30
Due Friday, Sept. 6, 11:59 pm:E-HW
01 Sections 7.1 - 7.2 Due Wednesday, Sept. 11, 11:59 pm:E-HW
02 Sections 7.3 Due Friday, Sept. 13:
Writing Assignment 1:Bug on a Square Track For next class, Fri., Sept. 6, please come prepared with the
first two pages of WR1 completed.
Fri., Sept. 6
Chapter 7 Skills Refresher Special Angles cont'd
Today's objectives:
1. Find exact values of sine and cosine for multiples of 30°, 45°, and 60° or their radian equivalents π/6, π /4, or π /3.
2. Use proportional reasoning to find sides of special triangles.
Do (for practice):
Flash Card
Ch 7 Skills Refresher
Properties of Special Triangles
Flash Card
Ch 7 Skills Refresher
Exact Values of Sine and Cosine
If you have a text, see
Chapter 7
Skills Refresher
(page 324) -- 1 - 24, 26-31
Due tonight, Friday, Sept. 6, 11:59 pm:E-HW
01 Sections 7.1 - 7.2 Due Wednesday, Sept. 11, 11:59 pm:E-HW
02 Sections 7.3 Due Friday, Sept. 13, 11:59 pm:E-HW
03 Chapter 7 Skills Refresher Due Friday, Sept. 13:
Writing Assignment 1:Bug on a Square Track
Prepare for QUIZ 2 next Monday, Sept. 9 over
7.1 and 7.2
Class meetingg
Topic
Assignment
Mon, Sept. 9
Section 7.4
Graphs of the Sine and Cosine (and Outside Changes to the Formula)
Today: QUIZ 2 over 7.1 and
7.2 We explored the graph of y = Asin(x) + k
(Outside additive and multiplicative changes)
Today's objectives:
1. Solve simple trig equations over a requested interval; for example on the
interval [0, 2π) find θ if sin θ = 1/2, providing exact values
of angles measured in radians when they are multiples of π/6, π /4, or π /3.
Be aware of when more than one solution exists! Be able to sketch the angle
or angles.
2. Know the main characteristics (period, amplitude, midline, domain, range,
odd/even symmetry, when it is positive, negative, increasing, decreasing, if
it starts at or above the midline) of the graph of y = sin θ,
and y = cos θ. Relate this to the unit circle as the x-coordinate
(cosine) or the y-coordinate (sine) of the point on the circle.
3. For y = Asin(x) + k or y = Acos(x)
+ k , identify the period, amplitude, and midline.
We discussed the domain, range, period, and amplitude of y
=sin(x) and y = cos(x) and how these can be
determined from the unit circle.
We looked at an outside change to the
function, which results in the original function being transformed vertically
(change to the output).
y = Asin(x) and y = Acos(x)
have amplitude |A|.
For A > 0, the graph of y = Asin(x) vertically stretches or
compresses the graph of y =sin(x) by A units.
the graph of y =–Asin(x)
is a vertical reflection of the graph of y = Asin(x).
Similarly for y =cos(x).
y =sin(x) + k and y = cos(x)
+ k have midlinek.
For k > 0, the graph of y =sin(x) + k vertically shifts
the graph of y =sin(x) up k units.
the graph of y = sin(x)
–k
vertically shifts the graph of y =sin(x) down k
units.
Similarly for y =cos(x).
The first multiplies the output by a quantity; the second
adds/subtracts a quantity to the output.
Do (for practice):
Flash Card 7.4
Period, Amplitude, Midline
If you have a text, see
Section 7.4 -- 1-24, 26-30, 34-38 Due Wednesday, Sept. 11, 11:59 pm:E-HW
02 Sections 7.3 Due Friday, Sept. 13, 11:59 pm:E-HW
03 Chapter 7 Skills Refresher Due Friday, Sept. 13:
Writing Assignment 1:Bug on a Square Track Due Monday, Sept. 16:
Writing Assignment 2:What's My
Angle?
Wed., Sept. 11
Section 7.5 The graph of
y =sin(Bx)
(Inside
multiplicative change)
For the function y = AsinBx + k we explored the effects of B on the period to find that,
for positive values of B, this graph hasa period of
2π/B, an amplitude of |A|, and midline which is y = k.
Do (for practice):
Flash Card 7.4
Period, Amplitude, Midline
Flash Card 7.5
Find a Formula of a Sine or Cosine Function (No Phase Shift Needed)
Flash Card 7.5
7.5 Find a Formula of a Sine or Cosine Function (Ferris Wheel)
If you have a text, see
Section 7.5 -- 1-12, 21-26
Due tonight, Wednesday,
Sept. 11, 11:59 pm:E-HW
02 Sections 7.3 Friday, Sept. 13:
QUIZ 3 over 7.3 and Chapter 7 Skills Refresher Due Friday, Sept. 13, 11:59 pm:E-HW
03 Chapter 7 Skills Refresher Due Friday, Sept. 13:
Writing Assignment 1:Bug on a Square Track Due Monday, Sept. 16:
Writing Assignment 2:What's My
Angle?