All Trigonometry Resources
Example Questions
Example Question #3 : Graphing Sine And Cosine
Let be a function defined as follows:
.
The 3 in the function above affects what attribute of the graph of ?
Period
Amplitude
Phase shift
Vertical shift
Vertical shift
The period of the function is indicated by the coefficient in front of ; here the period is unchanged.
The amplitude of the function is given by the coefficient in front of the ; here the amplitude is 2.
The phase shift is given by the value being added or subtracted inside the function; here the shift is units to the right.
The only unexamined attribute of the graph is the vertical shift, so 3 is the vertical shift of the graph.
Example Question #21 : Trigonometric Graphs
What is an equation for the above function, enlarged below?
The amplitude of a sinusoidal function is unless amplified by a constant in front of the equation. In this case, the amplitude is , so the front constant is .
The graph moves through the origin, so it is either a sine or a shifted cosine graph.
It repeats once in every , as opposed to the usual , so the period is doubled, the constant next to the variable is .
The only answer in which both the correct amplitude and period is found is:
Example Question #1 : Graphing Sine And Cosine
What is the domain of the sine function? What is the domain of the cosine function?
Domain of sine: all real numbers
Domain of cosine: all real numbers
Domain of sine: all real numbers
Domain of cosine:
Domain of sine:
Domain of cosine: all real numbers
Domain of sine:
Domain of cosine:
Domain of sine: all real numbers
Domain of cosine: all real numbers
Both sine and cosine functions go on infinitely to the left and right when viewed on a graph. For this reason, each of these functions has domains of "all real numbers."
Alternatively, each of these functions ranges between -1 and 1 in the y direction. The incorrect answers all include , which is the range of both the sine and the cosine functions.
Example Question #69 : Trigonometric Functions And Graphs
Which of the following would correctly translate the function into ?
Shift 1 unit down
Shift to the left units
Shift 1 unit up
Shift to the left units
Shift to the right units
Shift to the left units
The graph of is shown in red below, and the graph of is shown in blue below. Because the function is periodic, there are infinitely many transformations that could allow to translate into , but there is only one answer choice below that is correct, and that is "shift to the left units." Per the graph, shifting to the right units would also be correct, but that is not an available answer choice.
Example Question #5 : Graphing Sine And Cosine
Which of the following graphs represents the function ?
The graph of is:
This graph goes through three transformations. First, take the graph of , in blue below, and flip it over the x-axis. We do this because of the negative sign in front of the cosine function. You can see the resulting graph in green below. Next, we want to stretch the graph by a factor of 2, since our amplitude is 2 (we get this from the coefficient in front of the cosine function). You can see the resulting graph in purple, below.
Finally, we need to shift the graph up 1 unit. This is represented by the black graph, below.
The incorrect answers display the graphs of the functions , , and .
Example Question #142 : Trigonometry
Give the equation of the following graph.
Looking at our graph, we can tell that the period is . Using the formula
where is the coefficient of and is the period, we can calculate
This eliminates one answer choice. We then retrun to our graph and see that the amplitude is 3. Remembering that the amplitude is the number in front of the function, we can eliminate two more choices.
We then examine our graph and realize it contains the point . Plugging 0 into our two remaining choices, we can determine which one gives us 4 for a result.
Example Question #22 : Trigonometric Graphs
This is the graph of what function of x?
is shown in red, and is shown in blue.
Example Question #1 : Graphing Secant And Cosecant
Which of the following is the graph of ?
In order to graph , recall that . First consider the graph .
Now anywhere this graph crosses the x-axis a vertical asymptote will form for the graph because the denominator of will be equal to zero and the function will be undefined. At each maximum and minimum of , the graph of will invert at that point.
And then we are left with the graph of .
Example Question #1 : Graphing Secant And Cosecant
Considering the general form of the cosecant transformation function , what does each letter, (A, B, C, and D) correspond to?
A = Amplitude , Period , C = Vertical Shift, D = Phase Shift
A = Phase Shift , B = Period , C = Amplitude, D = Vertical Shift
A = Amplitude , Period , C = Phase Shift, D = Vertical Shift
A = Amplitude , B = Period , C = Phase Shift, D = Vertical Shift
A = Amplitude , Period , C = Phase Shift, D = Vertical Shift
Since cosecant is a reciprocal of sine, it uses the same general formula of the sine function with the letters corresponding to the same transformations. Note that while A does correspond to amplitude, the cosecant function extends infinitely upwards and downwards so there is no amplitude for the graphs.
Example Question #3 : Graphing Secant And Cosecant
Which of the following is the graph of ?
Knowing that the graph of is
we can use the general form of the cosecant transformation equation, , and apply these transformations. We can ignore because in this case . In this case and so our period is:
Period =
Period =
Period =
is the normal period for cosecant graphs and so we do not have to worry about lengthening or shortening the period. and so we need to apply a phase shift of . This will cause our graph to shift left a total of units.
Lastly, we must apply the transformation for , so we will have an upward vertical shift of 1 unit.
The application of these transformations leaves us with our graph of .
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