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Example Questions
Example Question #1 : How To Find The Range Of The Sine
Which of the following statements is (are) true:
I. The domain of the tangent function is all real numbers
II. The range of the sine function is all real numbers
III. The periods of the tangent, sine, and cosine functions are the same.
II and III only
I and II only
II only
I only
none of the above
II only
The domain of the tangent function does not include any values of x that are odd multiples of π/2 .
The range of the sine function is from [-1, 1].
The period of the tangent function is π, whereas the period for both sine and cosine is 2π.
Example Question #2 : How To Find The Range Of The Sine
Which of the following represents a sine wave with a range of ?
The range of a sine wave is altered by the coefficient placed in front of the base equation. So, if you have , this means that the highest point on the wave will be at and the lowest at . However, if you then begin to shift the equation vertically by adding values, as in, , then you need to account for said shift. This would make the minimum value to be and the maximum value to be . For our question, then, it is fine to use . The for the function parameter only alters the period of the equation, making its waves "thinner."
Example Question #1 : How To Find The Range Of The Sine
Which of the following sine waves has a range of to ?
The range of a sine wave is altered by the coefficient placed in front of the base equation. So, if you have , this means that the highest point on the wave will be at and the lowest at ; however, if you then begin to shift the equation vertically by adding values, as in, , then you need to account for said shift. This would make the minimum value to be and the maximum value to be .
For our question, the range of values covers . This range is accomplished by having either or as your coefficient. ( merely flips the equation over the -axis. The range "spread" remains the same.) We need to make the upper value to be instead of . To do this, you will need to add to . This requires an upward shift of . An example of performing a shift like this is:
Among the possible answers, the one that works is:
The parameter does not matter, as it only alters the frequency of the function.
Example Question #1 : How To Find The Range Of The Sine
What is the range of the trigonometric function given by the equation:
The range of the sine and cosine functions are the closed interval from the negative amplitude and the positive amplitude. The amplitude is given by the coefficient, in the following general equation:
. Thus we see the range is:
Example Question #2 : How To Find The Range Of The Sine
What is the range of the following trigonometric equation:
?
The range of a sine or cosine function spans from the negative amplitude to the positive amplitude. The amplitude is in the general formula:
Thus we see amplitude of our function is and so the range is:
Example Question #1 : How To Find Negative Sine
If , what is if is between and ?
Recall that .
Therefore, we are looking for or .
Now, this has a reference angle of , but it is in the third quadrant. This means that the value will be negative. The value of is . However, given the quadrant of our angle, it will be .
Example Question #2 : How To Find Negative Sine
What is the sine of the angle formed between the origin and the point if that angle is formed with one side of the angle beginning on the -axis and then rotating counter-clockwise to ?
You can begin by imagining a little triangle in the fourth quadrant to find your reference angle. It would look like this:
Now, to find the sine of that angle, you will need to find the hypotenuse of the triangle. Using the Pythagorean Theorem, , where and are leg lengths and is the length of the hypotenuse, the hypotenuse is , or, for our data:
The sine of an angle is:
For our data, this is:
Since this is in the fourth quadrant, it is negative, because sine is negative in that quadrant.
Example Question #1 : How To Find Negative Sine
What is the sine of the angle formed between the origin and the point if that angle is formed with one side of the angle beginning on the -axis and then rotating counter-clockwise to ?
You can begin by imagining a little triangle in the third quadrant to find your reference angle. It would look like this:
Now, to find the sine of that angle, you will need to find the hypotenuse of the triangle. Using the Pythagorean Theorem, , where and are leg lengths and is the length of the hypotenuse, the hypotenuse is , or, for our data:
The sine of an angle is:
For our data, this is:
Since this is in the third quadrant, it is negative, because sine is negative in that quadrant.
Example Question #61 : Trigonometry
If , what is the value of if ?
Recall that the triangle appears as follows in radians:
Now, the sine of is . However, if you rationalize the denominator, you get:
Since , we know that must be represent an angle in the third quadrant (where the sine function is negative). Adding its reference angle to , we get:
Therefore, we know that:
, meaning that
Example Question #1 : How To Find Positive Sine
If , what is ? Round to the nearest hundredth.
Recall that the sine wave is symmetrical with respect to the origin. Therefore, for any value , the value for is . Therefore, if is , then for , it will be .
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