Graphing curves Graph the curves described by the following functions, indicating the positive orientation. 18. r ( t ) = 〈 3 cos t , 2 sin t 〉 , for 0 ≤ t ≤ 2 π
Graphing curves Graph the curves described by the following functions, indicating the positive orientation. 18. r ( t ) = 〈 3 cos t , 2 sin t 〉 , for 0 ≤ t ≤ 2 π
. Energy Usage A mathematics textbook author has determined
that her monthly gas usage y approximately follows the sine curve
y = 12.5 sin(t + 1.2)) + 14.7,
where y is measured in thousands of cubic feet (MCF) and t is
the month of the year ranging from 1 to 12.
(a) Graph this function on a graphing calculator.
(b) Find the approximate gas usage for the months of
February and July.
(c) Find dy/dt, when t = 7. Interpret your answer.
(d) Estimate the total gas usage for the year.
2. Sketch the graph of r = 1 – 2 cos 0. Find tangents at the pole, all vertical
and horizontal tangents.
B
G
A
F
y = D
E
For the following sinusoidal function:
• State the amplitude, period, phase shift, and vertical shift.
• State the coordinates of the points A, B, C, E, F, and G. Since the functions are periodic, there
are several correct answers. For these functions, make the point A be as close to the origin as
possible.
Notice that the horizontal line is not the horizontal axis, but rather, the line y = D.
y = 2 sin((27)x)
Amplitude:
Period:
Phase shift:
Vertical shift:
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