### All Precalculus Resources

## Example Questions

### Example Question #107 : Graphing Functions

Which of the trigonometric functions is represented by this graph?

**Possible Answers:**

y = sec x

y = tan x

y = csc x

y = cot x

**Correct answer:**

y = csc x

This graph is the graph of y = csc x. The domain of this function is all real numbers except where n is any integer. In other words, there are vertical asymptotes at all multiples of . The range of this function is . The period of this function is .

### Example Question #108 : Graphing Functions

Which of the following functions is represented by this graph?

**Possible Answers:**

y = cot x

y = tan x

y = sec x

y = csc x

**Correct answer:**

y = cot x

This graph is the graph of y = cot x. The domain of this function is all real numbers except where n is any integer. In other words, there are vertical asymptotes at all multiples of . The range of this function is . The period of this function is .

### Example Question #109 : Graphing Functions

Which of the following functions is represented by this graph?

**Possible Answers:**

y = cot x

y = sec x

y = csc x

y = tan x

**Correct answer:**

y = sec x

This graph is the graph of y = sec x. The domain of this function is all real numbers except where n is any integer. In other words, there are vertical asymptotes at , , , and so on. The range of this function is . The period of this function is

### Example Question #110 : Graphing Functions

Which of the following functions is represented by this graph?

**Possible Answers:**

y = cot x

y = sec x

y = tan x

y = csc x

**Correct answer:**

y = tan x

This graph is the graph of y = tan x. The domain of this function is all real numbers except where n is any integer. In other words, there are vertical asymptotes at , and so on. The range of this function is . The period of this function is .

### Example Question #1 : Trigonometric Graphs (All Six)

Which of the following functions has a y-intercept of ?

**Possible Answers:**

**Correct answer:**

The y-intercept of a function is found by substituting . When we do this to each, we can determine the y-intercept. Don't forget your unit circle!

Thus, the function with a y-intercept of is .

### Example Question #1 : Trigonometric Graphs (All Six)

Which of the following functions is represented by this graph?

**Possible Answers:**

y = sec(x)

y = tan(x)

y = csc(x)

y = cos(x)

y = sin(x)

**Correct answer:**

y = cos(x)

This graph is the graph of y = cos x. The domain of this function is all real numbers. The range of this function is . The period of this function is .

### Example Question #2 : Trigonometric Graphs (All Six)

Which of the following functions is represented by this graph?

**Possible Answers:**

y = cos x

y = sec x

y = csc x

y = sin x

y = tan x

**Correct answer:**

y = sin x

This graph is the graph of y = sin x. The domain of this function is all real numbers. The range of this function is . The period of this function is .

### Example Question #1 : Trigonometric Graphs (All Six)

True or false: If you translate a secant function units to the left along the x-axis, you will have a cosecant curve.

**Possible Answers:**

False

True

**Correct answer:**

False

This is false. While the graphs of secant and cosecant functions are related, in order to turn a secant function into a cosecant function, you'd need to translate the original graph units to the right to obtain a cosecant graph.

### Example Question #121 : Graphing Functions

Where does the tangent function intercept the x-axis?

**Possible Answers:**

x= all real numbers

No solution

**Correct answer:**

Because the tangent function is periodic, it intercepts the x-axis in infinitely many places. We can see several of these in the graph below:

In the photo, we can see that the function is intercepting the x-axis at Generalizing this, we can say that the tangent function intercepts the x-axis for for all values of n such that n is an integer.

### Example Question #121 : Graphing Functions

True or false: If you translate a sine curve 90^{o} to the left along the x-axis, you will have a cosine curve.

**Possible Answers:**

True

False

**Correct answer:**

True

This is true! Notice the similarity of the shape between the graphs, but that they intercept the x-axis at different spots, and their peaks and valleys are at different spots.

y=sin(x), passes through the point (0,0)

y=cos(x), passes through the point (0,1)